Halo Fountain, Kelpie Guide, and Incubation Druid

Prerequisites

• Halo Fountain on the battlefield
• Kelpie Guide on the battlefield
• Incubation Druid on the battlefield

Steps

1. Activate Incubation Druid by tapping it, adding Activate Kelpie Guide by tapping it, targeting Halo Fountain
2. Holding priority, activate Halo Fountain by paying , tapping it, and untapping Kelpie Guide and Incubation Druid, causing you to draw a card
3. Resolve the Kelpie Guide ability, untapping Halo Fountain
4. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite creature ETB
• Near-infinite creature tokens