Koll, the Forgemaster + Demonmail Hauberk + Su-Chi Cave Guard + Grafted Wargear

Koll, the Forgemaster

Demonmail Hauberk

Su-Chi Cave Guard

Grafted Wargear

How it works

1. Activate Grafted Wargear's equip ability by paying 0, attaching it to Su-Chi Cave Guard.
2. Activate Demonmail Hauberk by sacrificing Su-Chi Cave Guard, targeting Koll.
3. When Su-Chi Cave Guard dies, it and Koll trigger.
4. Resolve the Su-Chi Cave Guard trigger, adding eight C.
5. Resolve the Koll trigger, returning it from your graveyard to your hand.
6. Resolve the Demonmail Hauberk ability, attaching it to Koll.
7. Cast Su-Chi Cave Guard by paying its mana cost.
8. Repeat.