Emeria Captain

A four-mana 1/1 that arrives as a 5/5 flier is the pitch, and the fine print is the bill you settled to get there. The counter it gains on entry scales one-to-one with the roles you have assembled, and because the creature is itself a Warrior, it always counts toward its own total: the body is never smaller than a 2/2 out of the box, and it climbs from there as each of the other three types shows up on the board. The mechanism matters as much as the size. Because the boost arrives as permanent +1/+1 counters welded onto the creature rather than a floating anthem, it survives the deaths of the party members that powered it: trade away the Rogue and the Wizard after this resolves, and it keeps its stats intact. That durability is the real reward for the setup; you are not renting the stats, you own them. Vigilance is the piece that keeps it from being a plain beater, letting a maxed-out body swing and still guard the ground a go-wide creature deck depends on. Everything folds back into the same deckbuilding demand: the fourth role is always the last one to fall into place, so the difference between a 4/4 and the full 5/5 is whether you rounded out every corner of the board before this landed.