Felidar Sovereign is a mythic Creature — Cat Beast card from Foundations Jumpstart (J25), collector number 198. Current market price: $3.60, 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.