Halo Fountain, Vizier of Tumbling Sands, and Incubation Druid

Prerequisites

• Halo Fountain on the battlefield
• Vizier of Tumbling Sands on the battlefield
• Incubation Druid on the battlefield

Steps

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

Results

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