Vaultborn Tyrant

Green's payoffs for going big have usually been terminal: a fatty resolves, it threatens lethal, and if it dies you have spent seven mana on nothing. This one refuses to end the transaction there. The power-4-or-greater trigger turns your whole board of large creatures into a life-and-cards engine, so the same board that was already attacking now refills your hand every time another threat lands, and the death clause means removing it costs the opponent a card without netting them tempo: kill it and you get an artifact copy of it back, engine and body intact. That second half is the more interesting piece of design. Green has spent most of its history bad at recursion and bad at insurance; here the insurance is baked into the creature itself, gated only by the token clause so the copy cannot loop infinitely off a sacrifice outlet. The result is a card that answers the two things that normally make expensive green creatures a liability, card disadvantage and vulnerability to removal, in a single frame, without leaving green's lane of just being enormous. The trample is almost incidental to how it wins, and the real threat is that trading with it barely slows the flow of cards.