Requires

All Will Be One must be on the battlefield. Opalescence must be on the battlefield. Triumph of the Hordes must be in hand. You have a way to put a counter on a permanent or player. Mana needed:

Steps

1. Cast Triumph of the Hordes by paying , giving creatures you control +1/+1 and infect until end of turn.
2. Put a counter on a permanent or player.
3. All Will Be One triggers, giving an opponent a poison counter.
4. Repeat step 3.

Results