Sinister Cryologist

The keyword here splits one enters-trigger creature into two decisions instead of one. Normally a body with a shrink stapled to its arrival makes you commit the whole package at once: pay full price, land the 2/3, spend the -3/-0 as a sunk cost the moment it resolves. Here a single blue mana buys the trigger alone, softening an opponent's creature by three power for the turn, after which the Jellyfish Wizard exiles itself and waits in reserve. Cast it for real later and the trigger fires a second time, so the power reduction and the permanent commitment land on separate turns of your choosing. That makes it an instrument of pacing rather than a combat trick. With no flash, both casts happen on your own turn, which means the shrink is a proactive move: weakening a threat before you attack into it, or dampening the board on the way to committing the body, never a reactive answer to an incoming swing. The effect is deliberately gentle. It only reduces power, never toughness, so it removes nothing and does not keep a creature from blocking; it buys tempo and nothing more. The design prices a delayed, splittable power-shrink low enough to be worth two casts without letting it snowball, and leans on the reserve-and-recast structure so the two uses feel like two cards rather than one overloaded creature.