Merfolk Coralsmith

The pump ability points the wrong way, and that inversion is the whole design. Paying to make a creature bigger is the reflex; here the mana buys power at the cost of toughness, turning a durable 2/3 into a fragile 3/2 that ticks closer to death with each activation. That would be a strange offer on its own, except the body is built to profit from dying: the scry 2 on death means the mana you sink into shrinking its toughness is really a bet on which cards you want next. The Merfolk can chump a bigger attacker, trade into removal, or simply pump itself out of existence in a spare moment, and each of those exits pays out. It reads like a blue take on a red aristocrat piece: a creature whose value is unlocked by leaving the battlefield rather than staying on it, with the pump ability doubling as a self-immolation button when no attacker is available to do the job. The scry rewards a deck that cares about its top card, and the flexible toughness lets the pilot choose the moment. A modest common on rate, but a genuinely tidy piece of tension: the ability that weakens it is the same ability that lets you cash it in on your terms.