When Crookshank Kobolds enters the battlefield, Sai of the Shinobi triggers, attaching Sai of the Shinobi to Crookshank Kobolds.
Activate Goblin Bombardment by sacrificing Crookshank Kobolds.
When Crookshank Kobolds dies, Koll triggers, returning Crookshank Kobolds from your graveyard to your hand.
Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
Repeat.
By leveraging the zero-mana cost of Crookshank Kobolds, this sequence creates a self-sustaining loop that turns free sacrifices into lethal firepower. Each time the Kobolds enter the battlefield, Sai of the Shinobi automatically equips to them to satisfy Koll, the Forgemaster's requirement that the dying creature be equipped or enchanted. Once Goblin Bombardment sends the Kobolds to the graveyard, Koll's static-triggered ability rescues them straight back to your hand, allowing you to replay them endlessly for infinite damage and death triggers.