Archpriest of Iona
Most tribal payoffs ask how many copies of one type you can stack; this one asks how many different classes you can spread across a single board. Its power tracks the breadth of that spread (one each of Cleric, Rogue, Warrior, and Wizard), so it starts as a fragile body and only becomes a real clock once you have assembled the whole diverse quartet. That is a genuine tension for a low-to-the-ground white deck, which wants its cheap creatures to matter on turn one, not turn four; here the reward for building across four classes is an attacker that grows with each new type and hands out evasion every combat. The combat trigger demands a full party with no partial credit: assemble all four and it converts a ground stall into flying damage every turn, exactly the reach an aggressive creature deck otherwise lacks; fall a class short and it is a modest body whose ability never fires. That binary gate, either the party is complete or the trigger does nothing, sorts the players who treated diversity as a construction constraint from the outset from the ones who stumbled into three of the four. It is a build-around dressed as a one-drop, and it pays only the deck that committed to the four-class spread before it ever cast the card.
