Basalt Monolith + Heartstone + Mishra, Eminent One

Basalt Monolith

Heartstone

Mishra, Eminent One

How it works

1. At the beginning of your combat phase, Mishra triggers, creating a token copy of Basalt Monolith that is a 4/4 Construct with haste named Mishra's Warform.
2. Activate Mishra's Warform's first ability by tapping it, adding CCC.
3. Activate Mishra's Warform's last ability by paying 2, untapping it.
4. Repeat from step 2.