Koll, the Forgemaster + Skirk Prospector + Umbral Mantle

Koll, the Forgemaster

Skirk Prospector

Umbral Mantle

How it works

1. Activate Umbral Mantle's equip ability by paying 0, attaching it to Skirk Prospector.
2. Activate Skirk Prospector by sacrificing it, adding .
3. When Skirk Prospector dies, Koll triggers, returning Skirk Prospector from your graveyard to your hand.
4. Cast Skirk Prospector by paying .
5. Repeat.