Legate Lanius, Caesar's Ace is a uncommon Legendary Creature — Human Soldier card from Fallout (PIP), collector number 107. Current market price: $0.30 (foil $1.98), TCGplayer market prices via Scryfall.
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.