Trench Behemoth, Fastbond, and Radiant Fountain

Prerequisites

• Trench Behemoth on the battlefield
• Fastbond on the battlefield
• Radiant Fountain on the battlefield

Steps

1. Activate Trench Behemoth by returning Radiant Fountain from the battlefield to your hand, untapping it
2. Play Radiant Fountain, triggering it and Fastbond
3. Resolve the Radiant Fountain trigger, causing you to gain 2 life
4. Resolve the Fastbond trigger, dealing 1 damage to you
5. Activate Radiant Fountain by tapping it, adding
6. Repeat

Results

• Infinite colorless mana
• Infinite landfall triggers
• Infinite lifegain
• Infinite lifegain triggers