Saheeli, Sublime Artificer

The token-per-spell engine that Young Pyromancer and Monastery Mentor made famous, but wired into a planeswalker instead of a creature, and that inversion is the whole design cleverness. Because the Servos come off a triggered ability rather than a plus, the five starting loyalty is a health bar that only ever ticks down: the tokens wall Saheeli passively while her loyalty sits parked, and there is nothing to climb toward because nothing here needs building. The hybrid pips are honest; a deck casting a critical mass of instants and sorceries qualifies whether it leans blue or red, and the trigger justifies the card before you ever spend loyalty. The minus is the quieter half and easy to overlook, but it reframes what those Servos are for. Turning an artifact you control into a copy of another creature or artifact you control means the 1/1 chumps are not just fodder: point the ability at a Servo on your main phase and it becomes a copy of your best creature until end of turn, a threat conjured out of a token. Most decks win on the trigger alone and treat the copy clause as a rare finisher, but it is why the artifact subtype on those tokens earns its keep past flavor: it hands the token deck a one-turn upgrade path that a plain body factory never gets, gated only by the sorcery-speed timing that loyalty abilities always carry.