Pouncing Wurm
Kicker exists to let one card play two roles across the curve, and this is the green beatdown version of that idea stretched about as far as the keyword comfortably goes. Unkicked, it is a vanilla 3/3 for four: a body you cast when you have nothing better to do and the turn would otherwise be wasted. Pay the kicker and the same card becomes a 6/6 with haste for seven, attacking the turn it lands. The +1/+1 counters matter beyond the raw size: they make the creature a target for anything that doubles, moves, or feeds on counters, and they survive effects that reset base power and toughness. The haste is what justifies the premium; without it you are simply paying three extra mana for three extra points, and a 6/6 that has to wait a turn to swing is a much weaker proposition than one that connects immediately. The design tension sits in the deadweight floor: a 3/3 for four asks nothing and rewards nothing, so the card only earns its slot in a shell that can reliably reach the seven-mana ceiling. It is a smoothing tool for green ramp, a curve-topper disguised as a curve-filler, and a clean illustration of why kicker on a creature wants haste attached to keep the back half honest.
