Koll, the Forgemaster + Dissection Tools + Umbral Mantle + Cathodion

Koll, the Forgemaster

Dissection Tools

Umbral Mantle

Cathodion

How it works

1. Activate Umbral Mantle's equip ability by paying 0, attaching it to Cathodion.
2. Activate Dissection Tools by sacrificing Cathodion, targeting Koll.
3. When Cathodion dies, it and Koll trigger.
4. Resolve the Cathodion trigger, adding CCC.
5. Resolve the Koll trigger, returning it from your graveyard to your hand.
6. Resolve the Dissection Tools ability, attaching it to Koll.
7. Cast Cathodion by paying its mana cost.
8. Repeat.