Goblin Bombardment + Kithkin Spellduster + Thran Vigil

Goblin Bombardment

Kithkin Spellduster

Thran Vigil

How it works

1. Activate Goblin Bombardment by sacrificing Kithkin Spellduster.
2. When Kithkin Spellduster dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Thran Vigil triggers, putting a +1/+1 counter on Kithkin Spellduster.
4. Resolve the Goblin Bombardment ability.
5. Repeat.

This clever loop transforms a humble insect-clearing bird into an endless engine of destruction by pairing a persistent sacrifice outlet with a clever form of counter-mitigation. When you feed Kithkin Spellduster to Goblin Bombardment, its persist ability brings it straight back to the battlefield bearing a -1/-1 counter, but the watchful eye of Thran Vigil steps in the moment the bird leaves your graveyard to place a +1/+1 counter on it instead. Because +1/+1 and -1/-1 counters instantly annihilate each other through state-based actions, Kithkin Spellduster enters cleanly wiped of its penalty and ready to repeat the gruesome sacrifice all over again.