Fathom Mage, Horizon Chimera, and Archangel of Thune

Prerequisites

• Fathom Mage on the battlefield
• Horizon Chimera in hand
• Archangel of Thune on the battlefield
• available

Steps

1. Cast Horizon Chimera by paying
2. Horizon Chimera enters the battlefield, triggering Fathom Mage
3. Resolve Fathom Mage's trigger, putting a +1/+1 counter on Fathom Mage and drawing a card
4. Horizon Chimera triggers, gaining you 1 life
5. Archangel of Thune triggers, putting a +1/+1 counter on each creatures you control
6. Repeat from step 3

Results

• Near-infinite lifegain
• Infinite card draw
• Near-infinite lifegain triggers
• Infinite draw triggers
• Near-infinite +1/+1 counters on a creature