Legate Lanius, Caesar's Ace
From Fallout set
Legate Lanius, Caesar's Ace
Legendary Creature — Human Soldier
2/2
Decimate — When Legate Lanius enters, each opponent sacrifices a tenth of the creatures they control of their choice, rounded up.
Whenever an opponent sacrifices a creature, put a +1/+1 counter on Legate Lanius.