Buy @ TCGplayer
Sacrifice a creature. When you do, all creatures get -X/-X until end of turn, where X is the sacrificed creature's toughness.
Use the sacrificed creature’s toughness as it last existed on the battlefield to determine the value of X.
You don’t choose which creature to sacrifice until Tip the Scales resolves. You must sacrifice exactly one creature if you control one at that time. Doing so causes a “reflexive” ability to trigger. Players may respond to that ability knowing the value of X.
