Mystery Key

Card advantage stapled to attacking is normally the province of creatures that stay put: Ophidian, Curiosity, and their descendants keep drawing every turn a body connects. This inverts the arrangement. Instead of a stream, you get one burst of three, and the Equipment consumes itself on delivery rather than sticking around as a repeatable engine. The two mana and the equip fee are the cheap part; the real price is surviving to a combat step where an equipped creature actually lands a hit on a player. Miss that, and the card is inert metal on the board. That single-use payout is what keeps a three-card draw priced so low: a permanent draw engine tied to combat would be oppressive, so the design gates the reward behind connecting exactly once and then evaporating. It leans hard on the classic Equipment supporting cast (evasion, unblockable enablers, a creature already too large to trade into), not as a bonus but as the precondition for the whole thing working. And because sacrifice is baked into the trigger, there is no amortizing it: the payout and the disappearance happen in the same instant, so a second swing means a second copy and the full cost paid again. The ceiling is fixed at one clean swing, three cards drawn, and a battlefield slot that just went empty.