Grim Monolith + The Blackstaff of Waterdeep + Biomancer's Familiar

Grim Monolith
The Blackstaff of Waterdeep
Biomancer's Familiar

Requires
Grim Monolith must be on the battlefield. The Blackstaff of Waterdeep must be on the battlefield. Biomancer's Familiar must be on the battlefield. Grim Monolith does not have summoning sickness. Mana needed: u
Steps
  1. Activate Grim Monolith's first ability by tapping it, adding ccc.
  2. Activate The Blackstaff of Waterdeep by paying 1u and tapping it, causing Grim Monolith to become an artifact creature until end of turn.
  3. Activate Grim Monolith's second ability by paying 2, untapping it.
  4. Activate Grim Monolith's first ability by tapping it, adding ccc.
  5. Repeat from step 3.
Results
Infinite colorless mana.

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