Tethmos High Priest

Point a spell at this Cleric and the graveyard gives something back: that is the whole engine, and it runs on the same targeting you would already be doing to trigger heroic. Where most creatures of this stripe cash in your targeting spell for a counter or a token that stays put, this one converts every cantrip, combat trick, or aura aimed at it into a reanimation trigger, dragging a creature of mana value 2 or less out of the yard and onto the battlefield. The targeting requirement is the cost: you have to aim something at it, which steers the deck toward cheap protective or value spells that double as fuel. The two-or-less ceiling is the leash, confining the loop to small bodies (mana dorks, hatebears, sacrifice fodder, anything carrying its own enters-the-battlefield payload) rather than hauling back real threats. The machine sharpens when the returned creature is itself worth targeting again, or when a free-to-cast targeting spell can be replayed; then a 2/3 body becomes a recursion turnstile, grinding the graveyard into a steady drip of small creatures. It is a quietly combo-adjacent design dressed as a fair white three-drop: a heroic body that rewards not big swings but a deck built to keep pointing spells at it, again and again.