Nim Deathmantle + Goblin Bombardment + Famished Foragers + Panharmonicon

Nim Deathmantle

Goblin Bombardment

Famished Foragers

Panharmonicon

How it works

1. Activate Goblin Bombardment by sacrificing Famished Foragers.
2. When Famished Foragers dies, Nim Deathmantle triggers, causing you to pay 4 to return Famished Foragers from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. When Famished Foragers enters the battlefield, it triggers twice, adding six .
4. Resolve the Goblin Bombardment ability from step 1, dealing 1 damage to any target.
5. Repeat.
6. Once you have infinite mana, you may use Famished Foragers' ability to infinitely rummage.

This loop turns a modest sacrifice outlet into a devastating engine by exploiting the recursive power of Nim Deathmantle. You sacrifice Famished Foragers to Goblin Bombardment, which triggers the Deathmantle to return the creature to the battlefield for four mana. Thanks to Panharmonicon doubling its entry trigger, Famished Foragers generates six red mana—more than enough to pay for the Deathmantle's resurrection fee and net a surplus each time. This leaves you with infinite red mana and damage, plus the ability to cycle through your entire deck using the Foragers' rummaging ability.