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Hullbreaker Horror + Mana Vault + 1 card of your choice

Hullbreaker Horror on the battlefield Mana Vault on the battlefield

Card of your choice Permanent Castable for Any card of this kind, in hand

Played in 78 278 decks.

Steps

1. Activate Mana Vault by tapping it, adding .
2. Cast the permanent that can be cast using 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 .
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 or less, this combo nets infinite colorless mana.

Data: Commander Spellbook