Voidmage Prodigy

Counterspell built into a tribe, and the tribe is what turns a tap-out liability into an engine. The repeatable counter fires by paying two blue mana and feeding another Wizard into it, so the card was designed to lead a deck rather than slot into one: it rewards a board of bodies the way an aristocrats engine rewards fodder, except the sacrifice buys interaction on the stack instead of life loss. The morph wrinkle is the part that has aged best. Cast face down for three, it offers no clue to its identity; the opponent who taps out into that 2/2 cannot know whether they are about to eat a one-mana unmorph and a hard counter on their next spell. That guessing game is the whole tension morph was built to create, and this card weaponizes it in blue's signature register: the threat of a counter does as much work as the counter itself, and a face-down body lets you hold that threat at instant speed once you have the open mana and a Wizard to feed. Sacrificing the Prodigy to its own ability is legal when no other Wizard is around, which makes it a last-ditch counter that trades itself away, but the card clearly wants company. It is a tribal payoff and a control piece in the same two-mana frame, asking you to commit to Wizards before it pays anything back.