Instantáneo
Aquelarre — Elige una criatura objetivo que controlas y una criatura objetivo que no controlas. Si controlas tres o más criaturas con fuerzas distintas, pon un contador +1/+1 sobre la criatura elegida que controlas. Luego, las criaturas elegidas luchan entre sí. (Cada una hace un daño igual a su fuerza a la otra.)
If you control three or more creatures with different powers and the target creature you control is still a legal target as Duel for Dominance resolves but the target creature you don't control isn't, you will still put a +1/+1 counter on the creature you control. It isn't much of a duel, but your creature is still dominant.
Only the +1/+1 counter is contingent on having three or more creatures with different powers. The target creatures will still fight even if you don't have three or more creatures with different powers when Duel for Dominance resolves.