Nimitar, the Culling Wind

Ultimatum {2} (Other players can pay up to {6} of
this spell's cost by paying {2} any number of times.)
Flying, deathtouch
When Nimitar, the Culling Wind enters the battlefield, if you cast it, target opponent
sacrifices X creatures, where X is 3 minus the
number of times this spell's ultimatum cost
was paid.