1. Go to Mage Repository
2. Run command exemplified below:

For cards added since tagOrSha1 till head revision (you can replace HEAD with another tagOrSha1):
git log tagOrSha1..HEAD --diff-filter=A --name-status | sed -ne 's/^A[^u]Mage.Sets\/src\/mage\/sets\///p' | sort -u > added_cards.txt

for Windows: you need to replace ' by "" and remove -u in sort

Example for cards implemented from 0.8.7 till 0.9:
git log 9ac166abc92f70aebdbe34825880ff8f909465ed..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt
since 1.0.2-release:
git log 6b38cd5b18298b07962b969bfa2eb69c62839575..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt
since 1.0.3-release:
git log 7ba3d451da95183b8c1cfb732b332f640963cc4a..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt

git log 68333a2eff6b643b2028d18dad16d1f228be7a2c..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt
20130901
git log 10902581140fe4268fc12408f099ad82347d7cd0..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt
since 1.1.0-release:
git log d6c1075125e657d4dd2e7bb120e108bb4c4536ff..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt
since 1.1.2-2013_10_26-release:
git log 63889f5bd4faa0a0915bb1e845ca3a0bc1093070..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt
since 1.2.0
git log b724d7fe136abbe09144eb2824739df3238061ee..HEAD --diff-filter=A --name-status | sed -ne "s/^A[^u]Mage.Sets\/src\/mage\/sets\///p" | sort > added_cards.txt

3. Copy added_cards.txt to trunk\Utils folder
4. Run script:
> perl extract_in_wiki_format.perl
5. Open added_cards_in_wiki_format.txt
6. Copy content to release notes