Ensoul Artifact + Grim Monolith Combos

3 known combos featuring both cards in Commander

Infinite colorless mana Infinite untap of artifact creatures you control

Combo 1 with Voltaic Construct

Also requires: Voltaic Construct Voltaic Construct
Results: Infinite colorless mana · Infinite untap of artifact creatures you control
Steps
  1. Activate Grim Monolith by tapping it, adding {C}{C}{C}.
  2. Activate Voltaic Construct by paying {2}, untapping Grim Monolith.
  3. Repeat.

Combo 2 with Training Grounds

Also requires: Training Grounds Training Grounds
Results: Infinite colorless mana
Show steps
  1. Activate Grim Monolith's first ability by tapping it, adding {C}{C}{C}.
  2. Activate Grim Monolith's second ability by paying {2}, untapping it.
  3. Repeat.

Combo 3 with Biomancer's Familiar

Also requires: Biomancer's Familiar Biomancer's Familiar
Results: Infinite colorless mana
Show steps
  1. Activate Grim Monolith's first ability by tapping it, adding {C}{C}{C}.
  2. Activate Grim Monolith's second ability by paying {2}, untapping it.
  3. Repeat.
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