Sprouting Phytohydra + Aether Flash

Steps

1. Cast Sprouting Phytohydra by paying {4}{G}.
2. When Sprouting Phytohydra enters the battlefield, Aether Flash triggers, dealing 2 damage to Sprouting Phytohydra.
3. Sprouting Phytohydra dies as a state-based action due to having zero or less toughness.
4. Sprouting Phytohydra triggers, creating a token copy of itself.
5. Repeat from step 2.