Grim Monolith + Idris, Soul of the TARDIS + Training Grounds

UR identity

Commander legal

The 3 combo pieces

• Grim Monolith
• Idris, Soul of the TARDIS
• Training Grounds

What must be in place

Idris does not have summoning sickness.

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 {2}, untapping it.
3. Repeat.

What the combo produces

• Infinite colorless mana