There are four card types among cards in your graveyard.
You have a way to deal noncombat damage to an opponent.
Steps
Deal noncombat damage to an opponent.
Fear of Burning Alive triggers, dealing that much damage to a creature that opponent controls.
Repercussion triggers, dealing that much damage to the opponent.
Repeat from step 2.
Notes
You may begin the combo by dealing damage to an opponent's creature by swapping steps 2 and 3. You can also repeat this combo if you have multiple sources of dealing noncombat damage to an opponent, or if the source used deals damage to multiple opponents.