Halo Fountain, Karn, Silver Golem, and Argothian Elder

Prerequisites

• Halo Fountain on the battlefield
• Karn, Silver Golem on the battlefield
• Argothian Elder on the battlefield
• available

Steps

1. Activate Karn by paying , causing Halo Fountain to become a creature
2. Activate up to two lands by tapping them, adding at least
3. Activate Argothian Elder by tapping it, untapping the lands
4. Activate Halo Fountain's second ability by paying , tapping it, and then untapping it and Argothian Elder, causing you to draw a card
5. Repeat from step 2

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite creature tokens
• Near-infinite untap of creatures you control
• Near-infinite mana creatures you control can produce