Hullbreaker Horror + Mana Vault

Hullbreaker Horror

Mana Vault

How it works

1. Activate Mana Vault by tapping it, adding CCC.
2. Cast the permanent that can be cast using CC from your hand by paying its mana cost.
3. Hullbreaker Horror triggers, returning Mana Vault from the battlefield to your hand.
4. Cast Mana Vault by paying 1.
5. Hullbreaker Horror triggers, returning the permanent cast in step 2 from the battlefield to your hand.
6. Repeat.
7. If the permanent can be cast using C or less, this combo nets infinite colorless mana.