Ardent Electromancer
The rate is the entire pitch: cast this into a full spread and it refunds the three mana you spent plus a red on top, all attached to a 3/2 that can still swing. Priest of Urabrask and the older lineage of enter-and-make-mana bodies asked you to commit to a single tribe; the party count changes the shape of that ask. Because the tally caps at one apiece across the four roles, this creature does not reward a critical mass of any one type: it wants a diverse board, and it is itself a Wizard occupying one of those slots. That self-tag is the design's whole reason to exist and also its floor. Because it counts toward its own total, it always adds at least one red on entry, so even the empty-board case claws back a third of the cost while landing a body. The ceiling is fixed at four red, so this is not an engine that scales toward a broken turn; it is a rebate that gets cleaner as the board fills out, front-loading mana into a turn where you have already committed creatures rather than promising more later. The tension a card like this resolves is rewarding assembly without punishing the incomplete board, and the answer is a sliding refund anchored to the creature's own type line: one red guaranteed, four for the player who did the work.
