Koll, the Forgemaster + Reckless Barbarian + Umbral Mantle

Koll, the Forgemaster

Reckless Barbarian

Umbral Mantle

How it works

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