Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Goblin Bombardment + Howlgeist

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Goblin Bombardment

Howlgeist

How it works

1. Activate Goblin Bombardment by sacrificing Howlgeist
2. When Howlgeist dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Activate Goblin Bombardment by sacrificing Howlgeist
4. When Howlgeist dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Resolve both Goblin Bombardment abilities from step 1 and 3.
6. Repeat.