Mikaeus, the Unhallowed + Goblin Bombardment + Thunderblust

Mikaeus, the Unhallowed

Goblin Bombardment

Thunderblust

How it works

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

This cunning resurrection loop relies on a brilliant rules interaction between persist and undying to squeeze infinite value out of a single sacrifice outlet. By using Goblin Bombardment to continually hurl Thunderblust at any target, you trigger its built-in persist mechanic to bring it back with a -1/-1 counter; however, Mikaeus, the Unhallowed is there to grant it undying as well, which counters the next death with a +1/+1 counter instead. Because these opposing counters elegantly annihilate each other state-based-wise every time Thunderblust returns, the creature can alternate endlessly between persist and undying triggers. The result is an unstoppable engine of infinite death triggers and lethal damage, fueled entirely by Mikaeus, the Unhallowed's static buff and the tireless sacrifice fodder of Thunderblust and Goblin Bombardment.