Gravetiller Wurm

Morbid ties the payoff to a precondition the green ramp player rarely controls on their own turn, and this Wurm is the cleanest illustration of the deal: six mana buys a 4/4 trampler, or you sequence a death first and double the body to an 8/8. Morbid reads whether any creature died this turn, yours or an opponent's, which makes the bonus opportunistic rather than guaranteed; in a vacuum you get the small Wurm, and the design forces you to earn the big one through combat, removal, or a sacrifice resolved earlier in the turn. The mechanism matters here because it is a static ability generating a replacement effect at entry, not a delayed trigger: the counters are determined the instant the Wurm hits the battlefield, locked in with no way to reclaim them if the death lands a beat too late. That timing pressure is the whole tension, asking you to settle the rest of your turn's bookkeeping before you ever commit the mana. Trample is the quiet glue, ensuring whichever size shows up gets damage through a chump rather than stalling out. It sits in the lineage of green's reward-for-attrition fatties, the kind that convert a grindy board state into a payoff without demanding a build-around, and it belongs to an era when designers were testing conditional enters-the-battlefield bonuses keyed to the turn's events rather than to the permanent's own caster.