Triumph of the Hordes is a uncommon Sorcery card from The List (PLST), collector number NPH-123. Current market price: $13.67, TCGplayer market prices via Scryfall.
Until end of turn, creatures you control get +1/+1 and gain trample and infect. (Creatures with infect deal damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)