Quicksmith Genius

Looting tied to a build-around payoff: every artifact that enters under your control becomes a chance to pitch a dead card and dig for a live one. The trigger's whole appeal is that it stacks. A turn that drops two or three cheap artifacts on the battlefield (a Servo token here, a Treasure there, an artifact creature you were casting anyway) fires the ability once for each, converting a clunky hand into exactly what the deck wanted. The loots are optional and the discard comes first, which is the friction that pays for the engine: you only filter when you have something worth pitching, and you commit to the discard before you see the draw. That sequencing matters for graveyard decks, where the discard half is the actual point and the new card is the bonus. The body is the catch. A 3/2 in red wants to attack, and it does not survive much, so the engine you are leaning on lives on a creature that trades down and dies to nearly everything. Protecting a fragile artificer long enough for the artifact triggers to compound is the price of admission, and the payoff arrives only in a shell dense enough with cheap artifacts and tokens that even a turn or two of looting pulls real value out of it before removal answers the question.