Centaur Chieftain

Threshold cards lived or died on whether the deck could fuel them fast enough to matter, and this one stacks two payoffs in the same body to make the gamble worth taking. Below threshold, you have a hasty 3/3 that arrives ready to attack: not nothing, just unremarkable. Once the graveyard is deep enough, the same cast becomes a board-wide pump enabler, since the enters trigger fires every time the creature comes down and grants the whole team +1/+1 and trample at once. That second clause is what changes the card's strategic axis: with no flash and a bonus that only lasts until end of turn, it has to come down in your precombat main phase, where it converts a developed board into a finisher and lets even small attackers push damage through, because trample rewrites the math on every blocker. The wrinkle is that the trigger keys off the creature entering, not the threshold state itself, so the bonus is a one-shot tied to the cast rather than a standing effect; flicker or reanimation re-arms it. The design tension is the threshold bargain rendered in green's idiom: you pay nothing extra for the upside, but you do not collect it until the yard has done a full payload of work. Green has the tools to get there (self-mill, aggressive trades, fetch and ramp churn), and the reward is timed to land the turn the alpha strike connects.