Ascendant Acolyte

A payoff that reads its own board twice. The enters-with clause makes this creature a mirror of every +1/+1 counter you already have in play, arriving as large as the rest of your team is wide; the upkeep trigger then compounds whatever it landed as, doubling counters each turn rather than adding a fixed amount. That doubling is the whole geometry: a body that enters at four counters becomes eight, then sixteen, then thirty-two, on a schedule that outruns any linear pump spell in short order. The design trades immediacy for exponential patience, which is what fixes the price. It does nothing the turn it lands beyond copying a state that already exists, and it demands a counters-matter board wide enough to seed the mirror, so the ceiling only arrives if you have already invested elsewhere. What balances it is fragility: the entire engine sits on a 1/1 base that survives only by the counters it accumulates, and a single removal spell erases the compounding before the second doubling ever resolves. The upkeep timing matters too, since the growth happens on your turn rather than in response to anything, giving opponents a full rotation to answer the threat before it snowballs past reach. It is a counters-deck capstone built to reward a board that has already committed to the theme, not a card that builds that board itself.