Cho'Gath, Terror of the Void

Trample, Menace
At the start of your combat put a -1/-1 counter
on target creature. Then put X +1/+1 counters
on Cho'Gath, Terror of the Void, where X is the number of -1/-1 counters on any other creature.
"Your souls will feed the Void! There will be no end
to your suffering!"