How can you create a combo with Idris, Soul of the TARDIS, Grim Monolith, Biomancer's Familiar?
user
[START OF COMBO]This combo can be formed with Idris, Soul of the TARDIS, Grim Monolith, Biomancer's Familiar

Color identity: GUR
Mana cost: 
Steps:
  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 {2}, untapping it.
  3. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Idris, Soul of the TARDIS must be on the battlefield
  - Grim Monolith must be exiled
  - Biomancer's Familiar must be on the battlefield
  - Idris does not have summoning sickness.
[END OF COMBO PREREQUISITES]
assistant