Grateful Apparition

Proliferate had lived mostly on artifacts and sorceries before this, a mechanic you triggered from the command of your own turn: cast a spell, pay a cost, add a counter. Stapling it to a combat-damage trigger on an evasive body flips that relationship entirely. The mechanic becomes conditional on connecting, which turns counter growth into a reward for pressure rather than a fixed engine, and a 1/1 flier is about the cheapest delivery system imaginable for a repeatable proliferate that costs nothing beyond keeping it alive and swinging. The scaling is what makes this genuinely dangerous, because every hit compounds whatever counters are already somewhere on the board. A planeswalker ticks up an extra notch each turn without spending its own activation; a creature carrying +1/+1 counters from a prior source keeps growing without further investment; poison creeps toward ten faster than any single infect source manages alone. Left to itself the body has nothing to compound: it enters as a bare 1/1, so until some external effect places a counter on it, its own triggers only feed permanents elsewhere. That fragility is deliberate. A two-mana 1/1 dies to any spot removal or chump blocker, and that vulnerability is precisely the tax for handing so cheap a creature a proliferate that would warp a game if it could not be interrupted. Evasion plus a snowball trigger on the smallest legal frame is a familiar shape; the twist here is which resource it snowballs, and it does not much care where you point it.