Rootpath Purifier, Earthcraft, Gaea's Cradle, and Sprout Swarm

Prerequisites

• Rootpath Purifier on the battlefield
• Earthcraft on the battlefield
• Gaea's Cradle on the battlefield
• Sprout Swarm in hand

Steps

1. Activate Gaea's Cradle by tapping it, adding at least
2. Cast Sprout Swarm with buyback by paying , creating a 1/1 Saproling creature token and returning Sprout Swarm to your hand
3. Activate Earthcraft by tapping the Saproling, untapping Gaea's Cradle
4. Repeat

Results

• Infinite ETB
• Infinite storm count
• Infinite mana lands you control can produce
• Infinite green mana
• Infinite magecraft triggers
• Infinite tapped creature tokens
• Infinite untap of lands you control