Contortionist Troupe

Coven asks you to field creatures with different powers, and this card is the built-in joke inside that requirement: a scaling body whose own power is fixed the instant you announce X. Pour mana in and it lands as a large green threat already stacked with counters; the same X that sizes the beater is also the number it plants on the shared power curve, so a big cast risks colliding with a creature you already control on that exact value. Read the other way, a small X is the deliberate play, filling a gap the rest of your board leaves open to switch the end-step trigger on. What you cannot do is cast it for X=0 and expect a warm body: with a 0/0 printed base, an empty cast enters and dies to state-based actions before it does anything, so the enabler line still costs at least one counter to survive. That collision between beater and enabler is where the card lives. The mechanic rewards a board built around spread rather than repetition, and this is the piece that bends hardest to serve that condition: it works as the payoff you are protecting or the cheap enabler you are protecting it with, and which one it is gets decided before it ever hits the battlefield.