Agatha of the Vile Cauldron + Basalt Monolith + Xenic Poltergeist

BRG identity

Commander legal

The 3 combo pieces

• Agatha of the Vile Cauldron
• Basalt Monolith
• Xenic Poltergeist

What must be in place

Basalt Monolith and Xenic Poltergiest do not have summoning sickness.

How to execute it

1. Activate Xenic Poltergeist by tapping it, causing Basalt Monolith to become an artifact creature until end of turn.
2. Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
3. Activate Basalt Monolith's last ability by paying at most {2}, untapping it.
4. Repeat from step 2.

What the combo produces

• Infinite colorless mana