Sultai Scavenger

A 3/3 flyer that scales inversely with how long the game has gone: the more your bin has filled, the closer it gets to free. Delve is doing all the work, converting spent cards (dead lands, resolved removal, milled fodder) into a discount that can land this evasive body for a single mana in the midgame. The design ask is clean. You are cashing in a resource most decks already treat as spent, and a graveyard that fills as a natural byproduct of play pays this off without any assembly required. The wrinkle worth flagging is that delve draws from a shared bank: every card exiled to cast the Bird is a card unavailable to flashback, escape, or any other yard-fed payoff, so this closer competes with your own value engines for the same fuel. As a piece of black aggro-tempo design it sits at the polite, common-rarity end of the delve family, nowhere near the cards that got the mechanic notorious; nobody was banning a 3/3 flyer. What it demonstrates cleanly is the mechanic's core bargain: a fixed, fair-looking number printed on the card, with the actual price paid out of a resource your deck generates for free just by playing the game.