Agatha of the Vile Cauldron + Basalt Monolith + Karn, Silver Golem

RG identity

Commander legal

The 3 combo pieces

What must be in place

Basalt Monolith does not have summoning sickness.
Agatha of the Vile Cauldron has power 1 or greater.

How to execute it

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

What the combo produces