Galloping Lizrog
A counter-doubler whose entire payout is conditional on a board you have already built. The trigger reads generous (remove any number, put twice that many), but those counters have to exist somewhere on your creatures when this enters, and pulling them off feeds this body by shrinking everything else. So the effect wants a specific game state: a wide counters deck that has already scattered +1/+1s across its team and now wants to consolidate. Strip four counters off the board, land eight here, and the frog swings as an 11/11 with trample. The tension is that consolidation is exactly the play a removal spell wants to punish; counters are safer distributed across several bodies than piled onto one, where a single answer erases the whole investment. Absent any counters to move, you still get a 3/3 with trample for five, which is a floor no one is thrilled to hit but not a blank; the ETB is where the ceiling lives, and the body is just where the doubled counters land. That gap between floor and ceiling is the correct shape for a build-around: a modest fallback, a high payout gated behind setup a counters deck was doing anyway. Trample is the load-bearing keyword, stopping a lone chump blocker from absorbing all that mass and letting the swollen creature push its excess through to the player rather than stalling behind a 1/1.
