Trench Behemoth + Fastbond + Radiant Fountain

Trench Behemoth

Fastbond

Radiant Fountain

How it works

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 C.
6. Repeat.

This vintage combo turns a simple loop into an endless engine by letting you repeatedly bounce and replay Radiant Fountain using Trench Behemoth's activated ability. Because Fastbond removes normal land-drop restrictions and allows you to play any number of lands, it bridges the gap despite its life-payment penalty—a cost easily offset by the life you gain each time Radiant Fountain enters the battlefield. As you cycle the land back and forth, you generate infinite colorless mana with the help of the Fountain's mana ability while fueling endless landfall triggers and life gain.