Vantress Gargoyle

A 5/4 flyer for two mana is a rate that should not exist, and the body pays for it not with mana but with two combat locks it has to solve before it means anything. It cannot attack until the defending player has seven cards in their graveyard, and it cannot block until you are holding four cards yourself. The tap ability that mills each player a card is the release valve: it slowly fills the opposing graveyard toward the attack threshold while doing nothing for your own hand size, so the two conditions pull against each other on purpose. What that produces is a creature playing two different roles across a game. Early, while your hand is stocked, it is a wall in the air; later, once its own mill counter has ticked the opponent past seven, it becomes a genuine clock. The self-mill is not incidental chip damage but the on-board timer the card sets for its own activation, and it happens to feed graveyard-hungry strategies as a side effect. The whole exercise is an overstatted body sold at a discount in tempo and information rather than mana: managing a hand and a graveyard is the real cost of the flying 5/4 printed at the top, and because the two thresholds move in opposite directions, you are always trading one enabler off against the other.