diff --git a/Mage.Sets/src/mage/cards/m/MaestrosTheater.java b/Mage.Sets/src/mage/cards/m/MaestrosTheater.java
new file mode 100644
index 0000000000..f94bb2b173
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/m/MaestrosTheater.java
@@ -0,0 +1,57 @@
+package mage.cards.m;
+
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.common.delayed.ReflexiveTriggeredAbility;
+import mage.abilities.costs.common.SacrificeSourceCost;
+import mage.abilities.effects.common.DoWhenCostPaid;
+import mage.abilities.effects.common.GainLifeEffect;
+import mage.abilities.effects.common.search.SearchLibraryPutInPlayEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.SubType;
+import mage.constants.SuperType;
+import mage.filter.FilterCard;
+import mage.filter.predicate.Predicates;
+import mage.target.common.TargetCardInLibrary;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class MaestrosTheater extends CardImpl {
+
+    private static final FilterCard filter = new FilterCard("a basic Island, Swamp, or Mountain card");
+
+    static {
+        filter.add(SuperType.BASIC.getPredicate());
+        filter.add(Predicates.or(
+                SubType.ISLAND.getPredicate(),
+                SubType.SWAMP.getPredicate(),
+                SubType.MOUNTAIN.getPredicate()
+        ));
+    }
+
+    public MaestrosTheater(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.LAND}, "");
+
+        // When Maestros Theater enters the battlefield, sacrifice it. When you do, search your library for a basic Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle and you gain 1 life.
+        ReflexiveTriggeredAbility ability = new ReflexiveTriggeredAbility(new SearchLibraryPutInPlayEffect(
+                new TargetCardInLibrary(filter), true, true
+        ), false);
+        ability.addEffect(new GainLifeEffect(1).concatBy("and"));
+        this.addAbility(new EntersBattlefieldTriggeredAbility(new DoWhenCostPaid(
+                ability, new SacrificeSourceCost(), null, false
+        )));
+    }
+
+    private MaestrosTheater(final MaestrosTheater card) {
+        super(card);
+    }
+
+    @Override
+    public MaestrosTheater copy() {
+        return new MaestrosTheater(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/StreetsOfNewCapenna.java b/Mage.Sets/src/mage/sets/StreetsOfNewCapenna.java
index b4d64f8ff4..8e9e043253 100644
--- a/Mage.Sets/src/mage/sets/StreetsOfNewCapenna.java
+++ b/Mage.Sets/src/mage/sets/StreetsOfNewCapenna.java
@@ -40,6 +40,7 @@ public final class StreetsOfNewCapenna extends ExpansionSet {
         cards.add(new SetCardInfo("Light 'Em Up", 113, Rarity.COMMON, mage.cards.l.LightEmUp.class));
         cards.add(new SetCardInfo("Lord Xander, the Collector", 197, Rarity.MYTHIC, mage.cards.l.LordXanderTheCollector.class));
         cards.add(new SetCardInfo("Maestros Charm", 199, Rarity.UNCOMMON, mage.cards.m.MaestrosCharm.class));
+        cards.add(new SetCardInfo("Maestros Theater", 251, Rarity.COMMON, mage.cards.m.MaestrosTheater.class));
         cards.add(new SetCardInfo("Mountain", 268, Rarity.LAND, mage.cards.basiclands.Mountain.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Murder", 88, Rarity.COMMON, mage.cards.m.Murder.class));
         cards.add(new SetCardInfo("Obscura Charm", 208, Rarity.UNCOMMON, mage.cards.o.ObscuraCharm.class));
diff --git a/Mage/src/main/java/mage/abilities/effects/common/DoWhenCostPaid.java b/Mage/src/main/java/mage/abilities/effects/common/DoWhenCostPaid.java
index a58dc4974d..5e59c33ad6 100644
--- a/Mage/src/main/java/mage/abilities/effects/common/DoWhenCostPaid.java
+++ b/Mage/src/main/java/mage/abilities/effects/common/DoWhenCostPaid.java
@@ -1,6 +1,5 @@
 package mage.abilities.effects.common;
 
-import mage.MageObject;
 import mage.abilities.Ability;
 import mage.abilities.Mode;
 import mage.abilities.common.delayed.ReflexiveTriggeredAbility;
@@ -38,17 +37,23 @@ public class DoWhenCostPaid extends OneShotEffect {
         this.optional = effect.optional;
     }
 
+    private boolean checkOptional(Player player, Game game, Ability source) {
+        return optional && !player.chooseUse(
+                ability.getEffects().getOutcome(source, this.outcome),
+                CardUtil.replaceSourceName(
+                        chooseUseText, CardUtil.getSourceName(game, source)
+                ), source, game
+        );
+    }
+
     @Override
     public boolean apply(Game game, Ability source) {
         Player player = game.getPlayer(source.getControllerId());
-        MageObject mageObject = game.getObject(source);
-        if (player == null || mageObject == null) {
+        if (player == null) {
             return false;
         }
-        String message = CardUtil.replaceSourceName(chooseUseText, mageObject.getLogName());
-        Outcome payOutcome = ability.getEffects().getOutcome(source, this.outcome);
         if (!cost.canPay(source, source, player.getId(), game)
-                || (optional && !player.chooseUse(payOutcome, message, source, game))) {
+                || checkOptional(player, game, source)) {
             return false;
         }
         cost.clearPaid();
diff --git a/Mage/src/main/java/mage/util/CardUtil.java b/Mage/src/main/java/mage/util/CardUtil.java
index 8bffe072bd..f384fd416c 100644
--- a/Mage/src/main/java/mage/util/CardUtil.java
+++ b/Mage/src/main/java/mage/util/CardUtil.java
@@ -533,7 +533,7 @@ public final class CardUtil {
     }
 
     public static String replaceSourceName(String message, String sourceName) {
-        return message.replace("{this}", sourceName);
+        return message != null ? message.replace("{this}", sourceName) : null;
     }
 
     public static String booleanToFlipName(boolean flip) {
diff --git a/Utils/mtg-cards-data.txt b/Utils/mtg-cards-data.txt
index 5203680ad3..4b1a41acd4 100644
--- a/Utils/mtg-cards-data.txt
+++ b/Utils/mtg-cards-data.txt
@@ -43932,7 +43932,7 @@ Devilish Valet|Streets of New Capenna|105|R|{2}{R}|Creature - Devil Warrior|1|3|
 Jaxis, the Troublemaker|Streets of New Capenna|112|R|{3}{R}|Legendary Creature - Human Warrior|2|3|{R}, {T}, Discard a card: Create a token that's a copy of another target creature you control. It gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step. Activate only as a sorcery.$Blitz {1}{R}|
 Light 'Em Up|Streets of New Capenna|113|C|{1}{R}|Sorcery|||Casualty 2$Light 'Em Up deals 2 damage to target creature or planeswalker.|
 Strangle|Streets of New Capenna|125|C|{R}|Sorcery|||Strangle deals 3 damage to target creature or planeswalker.|
-Urabask, Heretic Praetor|Streets of New Capenna|129|M|{3}{R}{R}|Legendary Creature - Phyrexian Praetor|4|4|Haste$At the beginning of your upkeep, exile the top card of your library. You may play it this turn.$At the beginning of each opponent's upkeep, the next time they would draw a card this turn, instead they exile the top card of their library. They may play it this turn.|
+Urabrask, Heretic Praetor|Streets of New Capenna|129|M|{3}{R}{R}|Legendary Creature - Phyrexian Praetor|4|4|Haste$At the beginning of your upkeep, exile the top card of your library. You may play it this turn.$At the beginning of each opponent's upkeep, the next time they would draw a card this turn, instead they exile the top card of their library. They may play it this turn.|
 Courier's Briefcase|Streets of New Capenna|142|U|{1}{G}|Artifact - Treasure|||When Courier's Briefcase enters the battlefield, create a 1/1 green and white Citizen creature token.${T}, Sacrifice Courier's Briefcase: Add one mana of any color.${W}{U}{B}{R}{G}, {T}, Sacrifice Courier's Briefcase: Draw three cards.|
 Gala Greeters|Streets of New Capenna|148|R|{1}{G}|Creature - Elf Druid|1|1|Alliance — Whenever another creature enters the battlefield under your control, choose one that hasn't been chosen this turn—$• Put a +1/+1 counter on Gala Greeters.$• Create a tapped Treasure token.$• You gain 2 life.|
 Brokers Ascendancy|Streets of New Capenna|170|R|{G}{W}{U}|Enchantment|||At the beginning of your end step, put a +1/+1 counter on each creature you control and a loyalty counter on each planeswalker you control.|
@@ -43952,6 +43952,7 @@ Chrome Cat|Streets of New Capenna|236|C|{3}|Artifact Creature - Cat|3|2|When Chr
 Getaway Car|Streets of New Capenna|237|R|{3}|Artifact - Vehicle|4|3|Haste$Whenever Getaway Car attacks or blocks, return up to one target creature that crewed it this turn to its owner's hand.$Crew 1|
 Botanical Plaza|Streets of New Capenna|247|C||Land|||Botanical Plaza enters the battlefield tapped.${T}: Add {G} or {W}.${2}{G}{W}, {T}, Sacrifice Botanical Plaza: Draw a card.|
 Jetmir's Garden|Streets of New Capenna|250|R||Land - Mountain Forest Plains|||({T}: Add {R}, {G}, or {W}.)$Jetmir's Garden enters the battlefield tapped.$Cycling {3}|
+Maestros Theater|Streets of New Capenna|251|C||Land|||When Maestros Theater enters the battlefield, sacrifice it. When you do, search your library for a basic Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle and you gain 1 life.|
 Racers' Ring|Streets of New Capenna|253|C||Land|||Racers' Ring enters the battlefield tapped.${T}: Add {R} or {G}.${2}{R}{G}, {T}, Sacrifice Racers' Ring: Draw a card.|
 Raffine's Tower|Streets of New Capenna|254|R||Land - Plains Island Swamp|||({T}: Add {W}, {U}, or {B}.)$Raffine's Tower enters the battlefield tapped.$Cycling {3}|
 Skybridge Towers|Streets of New Capenna|256|C||Land|||Skybridge Towers enters the battlefield tapped.${T}: Add {W} or {U}.${2}{W}{U}, {T}, Sacrifice Skybridge Towers: Draw a card.|