Ruin Ghost

A flicker engine pointed at land instead of creatures, which sounds modest until you notice every enters-the-battlefield land trigger it can re-fire on a loop. Pay one white, tap the Spirit, and a land blinks out and back, resetting whatever happened the first time it arrived. The repeatability is the design's entire point: most blink effects in this color are one-shot spells, while this is an every-turn engine that returns as long as the body survives. Against the rate it asks for (a 1/1 and a white-per-activation tax), the payoff scales entirely with what the land does on entry: a land that drains, mills, scrys, or makes a token becomes a slow but inevitable value tap. The flicker doubles as protection, since exile-and-return dodges destruction or bounce aimed at the land in response, and it untaps a land you have already used, recovering a mana you spent earlier in the turn rather than generating new mana over time. The geometry of the body sets the ceiling: a 1/1 that has to survive and stay untapped to do anything, so the engine wants a board where it can sit unmolested and grind. Strip out the enter-the-battlefield lands and it activates for the sake of activating; surround it with them and it does the same structural work a creature-blink loop does, one card-type over.