Mortuary + Goblin Bombardment + Bontu's Monument + Gwenom, Remorseless

Mortuary

Goblin Bombardment

Bontu's Monument

Gwenom, Remorseless

How it works

1. Activate Goblin Bombardment by sacrificing a creature with mana value 1 or less.
2. When the creature dies, Mortuary triggers, putting the creature from your graveyard onto the top of your library.
3. Resolve the Goblin Bombardment ability.
4. Cast the creature from the top of your library by paying 1 life.
5. Bontu's Monument triggers, causing you to gain 1 life and each opponent to lose 1 life.
6. Repeat.

This loop creates an endless loop of carnage by cycling a creature with a mana value of 1 or less directly from the battlefield to your graveyard via Goblin Bombardment's sacrifice outlet. Mortuary immediately catches that death and places the creature right back on top of your library, where Gwenom, Remorseless grants you permission to play it again while dodging traditional mana costs by paying its life value instead. Meanwhile, Bontu's Monument quietly turns every single one of those recurrent creature castings into a steady drain on your opponents' life totals while comfortably offsetting the life you paid to Gwenom.