Activate Goblin Bombardment by sacrificing Iridescent Drake.
When Iridescent Drake dies, Necrogen Communion triggers, returning Iridescent Drake from your graveyard to the battlefield.
When Iridescent Drake enters the battlefield, it triggers, returning Necrogen Communion from your graveyard to the battlefield attached to Iridescent Drake.
Resolve the Goblin Bombardment ability from step 1, dealing 1 damage to any target.