Trench Behemoth + Fastbond + Seraph Sanctuary

Trench Behemoth

Fastbond

Seraph Sanctuary

How it works

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

By leveraging Fastbond, you bypass normal land-play restrictions to rapidly loop Seraph Sanctuary in and out of play. Each cycle uses Trench Behemoth's activated ability to bounce the land back to your hand for an untap, allowing you to replay it immediately while absorbing Fastbond's self-inflicted damage. Meanwhile, Seraph Sanctuary's entry trigger cushions that life loss by continually gaining you life, eventually leaving you with infinite colorless mana alongside limitless landfall and lifegain triggers.