({1} magic symbol) ({BP} magic symbol) plus either ({WB} magic symbol) or ({BP} magic symbol) available.
Steps
Cast
Mourning by paying ({1} magic symbol) and 2 life if able, or ({1} magic symbol) ({B} magic symbol) otherwise.
Each creature you control's extort ability and
Birgi trigger.
Resolve the
Birgi trigger, adding ({R} magic symbol) .
Resolve the first extort trigger, causing you to pay 2 life if able, or ({WB} magic symbol) otherwise, causing each opponent to lose 1 life and you to gain that much life.
Repeat step 4 for each remaining extort trigger.
Resolve
Mourning, attaching it to a creature you control.
Activate
Mourning by paying 2 life, returning it from the battlefield to your hand.
Repeat until an opponent loses the game due to having 0 or less life.
Notes
Once you have two or less opponents, the combo no longer makes enough life to continue. You may repeat the loop using your own resources as desired.
Results
Near-infinite lifegain.
Near-infinite lifeloss.
Near-infinite lifegain triggers.
Near-infinite storm count.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).