Koll, the Forgemaster + Sai of the Shinobi + Kobolds of Kher Keep + Goblin Bombardment

Koll, the Forgemaster

Sai of the Shinobi

Kobolds of Kher Keep

Goblin Bombardment

How it works

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

This loop is a masterclass in recycling tiny threats, turning the free-casting nature of Kobolds of Kher Keep into a relentless engine of destruction. Because Sai of the Shinobi automatically equips itself to the incoming creature, the Kobold always counts as equipped when it hits the graveyard, allowing Koll, the Forgemaster's static ability to seamlessly bounce it right back to your hand instead of staying dead. From there, you simply replay the Kobold for zero mana and feed it to Goblin Bombardment to ping down any target, repeating the cycle as many times as you desire for infinite damage and sacrifice triggers.