diff --git a/mtg.py b/mtg.py
index 791644c..104dc06 100644
--- a/mtg.py
+++ b/mtg.py
@@ -7,6 +7,96 @@ class Game:
     def __init__(self):
         self.players = []
 
+class Mana:
+    types = {
+        'W': 'White',
+        'U': 'Blue',
+        'B': 'Black',
+        'R': 'Red',
+        'G': 'Green',
+    }
+    def __init__(self, mana=None):
+        self.mana = {}
+        for type in Mana.types.keys():
+            self.mana[type] = 0
+        if mana:
+            # Can't just set self to result... ?
+            result = self + mana
+            self.mana = result.mana
+    def __add__(self, other):
+        result = Mana()
+        if isinstance(other, str):
+            for m in [c for c in other.upper() if c in Mana.types.keys()]:
+                result.mana[m] = result.mana[m] + 1
+        elif isinstance(other,Mana):
+            for (key, value) in other.mana.iteritems():
+                result.mana[key] = self.mana[key] + value
+        else:
+            # TODO: raise exception
+            raise Exception()
+            pass
+        return result
+    def __sub__(self, other):
+        result = Mana()
+        if isinstance(other, Mana):
+            for (key, value) in other.mana.iteritems():
+                result.mana[key] = self.mana[key] - value
+                if result.mana[key] < 0:
+                    raise Exception('Insufficient {0} Mana'.format(Mana.types[key]))
+        elif isinstance(other,ManaCost):
+            for (key, value) in other.mana.mana.iteritems():
+                result.mana[key] = self.mana[key] - value
+                if result.mana[key] < 0:
+                    raise Exception('Insufficient {0} Mana'.format(Mana.types[key]))
+            remaining = other.any
+            for (key, value) in result.mana.iteritems():
+                while result.mana[key] > 0 and remaining > 0:
+                    result.mana[key] = result.mana[key] - 1
+                    remaining = remaining - 1
+            if remaining > 0:
+                raise Exception('Insufficient Mana')
+        return result
+    def __repr__(self):
+        return ''.join([type * count for (type, count) in self.mana.iteritems()]) if self.converted() > 0 else '0'
+    def converted(self):
+        return sum(self.mana.values())
+
+class ManaCost:
+    def __init__(self, cost=None):
+        self.any = 0
+        self.mana = Mana()
+        if cost:
+            result = self + cost
+            self.any = result.any
+            self.mana = result.mana
+    def __add__(self, other):
+        result = ManaCost()
+        if isinstance(other, str):
+            result.mana = Mana(other)
+            value = ''
+            for c in other:
+                if c not in '0123456789': break
+                value = value + c
+            value = int(value) if len(value) > 0 else 0
+            result.any = value
+        elif isinstance(other, Mana):
+            result.mana = other
+        elif isinstance(other, ManaCost):
+            result.any = other.many
+            result.mana = other.many
+        return result
+    def __sub__(self, other):
+        if isinstance(other, ManaCost):
+            result.any = self.any - right.any
+            result.mana = self.mana - right.mana
+    def __repr__(self):
+        return '{0}{1}'.format(
+            self.any if self.any > 0 or self.mana.converted() == 0 else '',
+            self.mana if self.mana.converted() > 0 else ''
+        )
+    def converted(self):
+        return self.mana.converted() + self.any
+
 class Player:
     def __init__(self, name, deck=None):
         self.name = name