Beastrider Vanguard

A green two-drop that comes with a mana sink stapled to its back, and that sink is the whole point of the design. The body is a plain 2/2 Knight that trades or blocks early, but the activation gives the card a job long after the game has moved past turn two: dig three deep for a permanent, keep it, bury the rest. Green rarely gets card selection this clean, and the phrasing matters: it reveals a permanent, not a creature, so lands, artifacts, enchantments, and planeswalkers all count, which turns a stalled draw into fuel or a missed land drop into a fetched permanent of your choice. The cost is high enough that it is a late-game valve, not an early-game engine, which is the restriction that keeps a repeatable dig from running away with the game. The template is an old one in green: put a body on the table cheaply, then let excess mana convert into cards once the aggressive plan runs out of gas. What separates this from a vanilla creature is that it never becomes a dead draw; every point of extra mana after the curve fills out has somewhere to go. It asks nothing of the deck around it beyond a permanent-heavy library, which most green decks already run.