Leonin Warleader

The math runs away from the defender on every swing. A four-mana 4/4 is a fair body; attaching two lifelinking tokens that arrive already tapped and attacking is where the card stops playing fair. Each attack adds two more bodies and, because the Cats have lifelink, gains one life for every point of combat damage they land: two extra power on the board and up to two life back the turn the tokens exist, alongside whatever the Warleader itself connects for. That tapped-and-attacking clause is the load-bearing part: the tokens skip the summoning-sickness queue entirely, contributing the turn they are made rather than waiting to matter, so the board widens mid-combat instead of building up slowly behind the lines. It also means the value only triggers on offense, which keeps the engine honest: a parked Warleader does nothing, and racing it requires accepting that every unblocked swing tilts the life totals further out of reach. The lifelink is what nudges this from a plain go-wide token maker toward a creature that helps win damage races, gaining ground while it takes it. That combination of a self-replicating attack and incidental lifegain puts it in the lineage of go-wide token engines that punish opponents until they draw a board wipe, but its particular trick is compressing two fresh attackers and a life swing into a single trigger that fires for free as long as you keep attacking.