Felidar Sovereign is a rare Creature — Cat Beast card from Battle for Zendikar (BFZ), collector number 26. Current market price: $4.43 (foil $4.20), TCGplayer market prices via Scryfall.
Vigilance (Attacking doesn't cause this creature to tap.) Lifelink (Damage dealt by this creature also causes you to gain that much life.) At the beginning of your upkeep, if you have 40 or more life, you win the game.