Koll, the Forgemaster + Ronin Warclub + Phyrexian Walker + Goblin Bombardment

Koll, the Forgemaster

Ronin Warclub

Phyrexian Walker

Goblin Bombardment

How it works

1. Cast Phyrexian Walker by paying 0.
2. When Phyrexian Walker enters the battlefield, Ronin Warclub triggers, attaching Ronin Warclub 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.