Wolverine, Best There Is is a mythic Legendary Creature — Mutant Berserker Hero card from Secret Lair Drop (SLD), collector number 1737. Current market price: $27.24, TCGplayer market prices via Scryfall.
Unrivaled Lethality — Double all damage Wolverine would deal. At the beginning of each end step, if Wolverine dealt damage to another creature this turn, put a +1/+1 counter on him. {1}{G}: Regenerate Wolverine. (The next time he would be destroyed this turn, instead tap him, remove him from combat, and heal all damage on him.)