Alchemist's Apprentice

A body that exists only to be cashed in. The 1/1 is incidental: what the card actually sells is a deferred cantrip stapled to a chump blocker, payable the instant you no longer need the creature. The free sacrifice cost is the whole engine, because a sacrifice outlet that asks nothing in mana and replaces itself one-for-one is connective tissue, not a beater. It feeds anything that wants a creature to die on demand: an aristocrats death-trigger, a graveyard you'd rather fill, a way to dodge an exile-based removal spell at no card cost. The lineage runs through every cheap blue sacrifice-for-value body, and the relevant design tension is that the sacrifice carries no timing clause, so the card draws on your turn, on the opponent's turn, in response to removal, in combat after blocks have locked in. That instant-speed flexibility is the only thing separating it from a plain replacement-effect cantrip you cast from your hand. Where it loses ground is the trade baked in: you've paid two mana for a body you intend to throw away, and the math nets to card parity, not advantage. Sacrifice it, draw one, and you are back where you started minus a turn and the mana. So the deck has to be one that values the act of sacrificing more than the body or the card, because on its own this is just a slow, two-step way to replace itself.