Arcane Artisan

The repeatable filter is the whole pitch. Most copy effects ask you to hit something already on the battlefield or already in a graveyard; this one asks you to dig for the creature first, then keep it. Each activation is a guided loot: draw a card, then exile one, and if the card you toss is a creature, you get a token copy of it instead of a discard. That structure rewards a deck stuffed with bodies you would happily pitch and copy, and it punishes activations into a hand of removal and lands, since you exile whatever you pick and gain nothing for a noncreature. The leaves-the-battlefield clause is the leash: the tokens are borrowed, not bought, so killing the artisan claws back every copy at the next end step. That single line demotes a clean copy engine into a target. A 0/3 body broadcasts the danger and invites the kill, which means the real play pattern is racing to bank enough value before the artisan dies, or protecting it long enough to make the tokens permanent through some other means. It is a slow, telegraphed, mana-hungry machine, and the design is honest about that: you pay to activate every turn, you risk the whole board to a single removal spell, and in exchange you get to manufacture your best creatures one loot at a time.