Kurkesh, Onakke Ancient + Grim Monolith + Mycosynth Lattice

Kurkesh, Onakke Ancient

Grim Monolith

Mycosynth Lattice

How it works

1. Activate Grim Monolith's first ability by tapping it, adding CCC.
2. Activate Grim Monolith's last ability by paying 4.
3. Kurkesh triggers, causing you to pay 2 to copy Grim Monolith's last ability.
4. Resolve the copy of Grim Monolith's last ability, untapping it.
5. Activate Grim Monolith's first ability by tapping it, adding CCC.
6. Resolve the Grim Monolith ability from step 2, untapping it.
7. Repeat.