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

Grim Monolith

The Blackstaff of Waterdeep

Biomancer's Familiar

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.

This clever loop turns your own mana rock into an animated creature so you can abuse its untap cost. Normally, untapping Grim Monolith costs a steep four mana, but Biomancer's Familiar steps in to reduce that activation cost down to just two mana. Meanwhile, The Blackstaff of Waterdeep supplies the vital animation effect that turns Grim Monolith into an artifact creature, making it eligible for that cost reduction and setting up a self-sustaining engine that generates infinite colorless mana.