Wolverine, Fierce Fighter

The healing factor made mechanical: what most fight-on-entry creatures fear is the retaliation, the point where the target hits back hard enough to finish the attacker before the trade pays off. This body sidesteps that math entirely. The replacement effect means every fight, every combat, every burn spell that touches him leaves no lasting mark; the moment fresh damage lands, the old marked damage wipes clean. He is not hard to kill so much as impossible to whittle down. Chip damage does nothing. Repeated pings do nothing. What removes him is a single instance of damage that meets his toughness of 5 in one blow, damage carrying deathtouch or similar effects, or removal that deals no damage at all: exile, destruction, bounce, sacrifice. That is a genuinely unusual survival axis, and it turns the enters-and-fights trigger from a one-time removal spell into the opening move of a creature that will keep fighting and keep resetting. Pair that with haste and he arrives, fights a blocker or a threat, and swings the same turn, all while shrugging off whatever the fight sent back. The design reads flavor first (a regenerating berserker who simply does not stay hurt), but the rules text lands somewhere real: a red-green midrange body whose durability is not a toughness number to grind down but a rule about how damage refuses to accumulate on him at all.