Gray Merchant of Asphodel in hand or in your library (on top of your library).
All other permanents on the battlefield.
Easy Prerequisites
Your life total is at least 6 if Gray Merchant is on the top of your library, or you have ({3} magic symbol) ({B} magic symbol) ({B} magic symbol) available otherwise.
Notable Prerequisites
Gwenom has attacked this turn.
Steps
Cast Gray Merchant either from your hand by paying ({3} magic symbol) ({B} magic symbol) ({B} magic symbol) or from the top of your library by paying 5 life.
When Gray Merchant enters, it triggers, causing each opponent to lose life equal to your devotion to black and causing you to gain life equal to the life lost this way.
Activate
Goblin Bombardment by sacrificing Gray Merchant.
When Gray Merchant dies,
Mortuary triggers, putting Gray Merchant from your graveyard onto the top of your library.
Resolve the
Goblin Bombardment ability.
Repeat.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite damage.
Infinite lifegain triggers.
Infinite lifegain.
Infinite lifeloss.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).