Rush of Blood

The math is the trick: doubling a creature's power instead of granting a flat bonus means the spell scales with whatever it targets, and the bigger the body, the more lopsided the return. On a 2/2 it adds a forgettable +2; on a 6/3 it makes a 12/3 that swings for twelve; on something already inflated by another effect, it spirals fast. That makes it a pump spell that punishes the opponent for letting your board get large rather than one that bails out small creatures. Crucially, it leaves toughness untouched (+0), so it does nothing to keep the creature alive in combat or through removal; it is purely a damage amplifier, built for the turn you are pushing for lethal rather than the turn you are trying to survive. Holding it until after blocks are declared is where the spell turns dangerous: it folds into a combat-trick window to convert a trade into a blowout, and it pairs naturally with trample or evasion, where every extra point lands on the player rather than on a chump blocker. This is a finisher wearing a combat trick's clothes, and it rewards going tall with one oversized threat in a color that usually wants to go wide.