Grim Monolith + The Blackstaff of Waterdeep + Training Grounds

Grim Monolith

The Blackstaff of Waterdeep

Training Grounds

How it works

1. Activate Grim Monolith's first ability by tapping it, adding CCC.
2. Activate The Blackstaff of Waterdeep by paying 1 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.

By leveraging The Blackstaff of Waterdeep, you can turn your Grim Monolith into an animated artifact creature, bringing it under the cost-reducing influence of Training Grounds. Because Training Grounds lowers the untap activation of Grim Monolith from four generic mana down to just two, tapping the Monolith for three colorless mana leaves you with a net profit of one mana each cycle. This creates a self-sustaining loop that generates infinite colorless mana in formats like commander, legacy, oathbreaker, and vintage.