Agatha of the Vile Cauldron + Basalt Monolith + Karn, the Great Creator

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 Karn's first loyalty ability by putting a loyalty counter on it, causing Basalt Monolith to become a 3/3 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 second ability by paying at most {2}, untapping it.
  4. Repeat from step 2.

What the combo produces