Agatha of the Vile Cauldron + Grim Monolith + Idris, Soul of the TARDIS

GUR identity

Commander legal

The 3 combo pieces

What must be in place

Idris does not have summoning sickness.
Agatha of the Vile Cauldron has power 2 or greater.

How to execute it

  1. Activate Idris using Grim Monolith's first ability by tapping it, adding {C}{C}{C}.
  2. Activate Idris using Grim Monolith's second ability by paying at most {2}, untapping it.
  3. Repeat.

What the combo produces