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10 (in Japanese)

UR Ultra Rare STAR Starlight Rare DoomZ VII Seven - Elara X DARK Level 4 [ DragonEffect ] ATK 1400 DEF 1200 If this card is Normal or Special Summoned, or destroyed by card effect: You can Set 1 "DoomZ" Spell/Trap from your Deck

You must defeat him to earn four booster packs

This works well for Discard decks like Neheb, the WorthyNeheb, the Worthy, but also Magar

If you Ritual Summon exactly 1 Level 8 Ritual Monster with a card effect that requires use of monsters, this card can be used as the entire Tribute

For a more non-technical analysis on fake cards affecting the game, I recommend reading this article