Tip the Scales
From Tarkir: Dragonstorm Commander set
Tip the Scales
Sorcery
Sacrifice a creature. When you do, all creatures get -X/-X until end of turn, where X is the sacrificed creature's toughness.
Rulings
- 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.
- Use the sacrificed creature’s toughness as it last existed on the battlefield to determine the value of X.