Vorapede

Triple-green is the constraint that pays for everything else here, and it buys a body that is genuinely annoying to remove. Vigilance keeps the 5/4 attacking and blocking on the same turn, trample pushes damage through chumps, and undying means the first kill spell only resets the clock: the creature comes back as a 6/5, bigger and harder to answer the second time around. The design logic is that undying punishes one-for-one removal specifically. Damage-based answers and single-target kill spells just hand the creature a permanent upgrade, so the cleanest way past it is something that exiles or bounces rather than destroys. Board wipes are not the clean out they look like either: a sweeper kills it once and triggers the return, often leaving the bigger version alone on an empty board with nothing left to block it. The only way destruction sticks is to grow it past undying's no-counters condition first, switching the ability off, and few removal suites carry that kind of setup. That combination, a resilient attacker that wants to be killed in a particular way and resents being killed in the obvious way, is the whole design: a green midrange threat built less around raw size than around making the opponent's removal suite the problem. The intensive mana cost locks it to decks already committed to heavy green, but inside those decks it asks the defending player to have exactly the right answer rather than merely an answer.