Fire Ants + Cacophodon + Rite of Passage

Prerequisites

Cacophodon has toughness 2 or greater. Fire Ants does not have summoning sickness.

Steps

1. Activate Fire Ants by tapping it, dealing 1 damage to each other creature without flying.
2. Rite of Passage triggers for each creature you control that was dealt damage this way, and Cacophodon triggers once.
3. Resolve all Rite of Passage triggers, putting a +1/+1 counter on each creature you control that was dealt damage.
4. Resolve the Cacophodon trigger, untapping Fire Ants.
5. Repeat.