Fretwork Colony

A growth engine that bills you on the upkeep, not the cast. Two mana buys a 1/1 that gets bigger every turn whether you want it to or not: the +1/+1 counter and the fixed life loss are stapled to the same trigger, so there is no off switch and no choosing to coast. The growth is mandatory, and that is the wager. Left alone it becomes a real clock fast, but the can't-block clause strips away the usual consolation prize of a growing body, namely holding a lane on defense. This is a creature that only ever moves forward, never back. The counters also give it a second life as a payload rather than a pure beater: anything that cares about creatures with +1/+1 counters, or anything that wants to relocate a stockpile of them elsewhere, finds a willing donor here, since the body manufactures a fresh counter on a fixed schedule for free. The race it sets up is the whole pitch. Each upkeep is the same flat toll (one counter, one life), so the pressure is not that the payment escalates; it is that it never stops. Your opponent has to deal with it before its size outpaces the steady drip of life you spend to grow it, and you have to close before the accumulated tolls have quietly whittled your total down to a number the rest of the board can finish.