Koll, the Forgemaster + Sai of the Shinobi + Phyrexian Walker + Goblin Bombardment

Koll, the Forgemaster

Sai of the Shinobi

Phyrexian Walker

Goblin Bombardment

How it works

1. Cast Phyrexian Walker by paying 0.
2. When Phyrexian Walker enters the battlefield, Sai of the Shinobi triggers, attaching Sai of the Shinobi to Phyrexian Walker.
3. Activate Goblin Bombardment by sacrificing Phyrexian Walker.
4. When Phyrexian Walker dies, Koll triggers, returning Phyrexian Walker from your graveyard to your hand.
5. Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
6. Repeat.