Activate Zur by paying ({1} magic symbol) ({W} magic symbol) , causing All Will Be One to become an enchantment creature until end of turn.
Cast Triumph of the Hordes by paying ({2} magic symbol) ({G} magic symbol) ({G} magic symbol) , giving creatures you control +1/+1 and infect until end of turn.
Put a counter on a permanent or player.
All Will Be One triggers, giving an opponent a poison counter and causing you to gain 1 life.