Halo Fountain, Ilysian Caryatid, and Aphetto Alchemist

Prerequisites

• Halo Fountain on the battlefield
• Ilysian Caryatid on the battlefield
• Aphetto Alchemist on the battlefield

Steps

1. Activate Ilysian Caryatid by tapping it, adding Activate Aphetto Alchemist by tapping it, targeting Halo Fountain
2. Holding priority, activate Halo Fountain by paying , tapping it, and untapping Aphetto Alchemist and Ilysian Caryatid, causing you to draw a card
3. Resolve the Aphetto Alchemist ability, untapping Halo Fountain
4. Repeat

Results

• Infinite card draw
• Infinite draw triggers