Triumph of the Hordes

Until end of turn, creatures you control get
+1/+1 and gain trample (This creature can deal
excess combat damage to the player or planeswalker
it's attacking.) and infect (This creature deals
damage to creatures in the form of -1/-1 counters and
to players in the form of poison counters.).
As the swarm charges, poison-laden fangs strike, and victory is contagious. The triumph is swift and
absolute, leaving adversaries succumbing to a virulent
tide.