Activate Priest of Forgotten Gods by tapping it, sacrificing Reassembling Skeleton and any other creature.
When Reassembling Skeleton and the other creature die, Priest of Forgotten Gods triggers twice, untapping Priest of Forgotten Gods.
Resolve the Priest of Forgotten Gods ability from step 1, causing any number of players to lose 2 life and sacrifice a creature, and you to add {B}{B} and draw a card.
Activate Reassembling Skeleton by paying {1}{B}, returning it from your graveyard to the battlefield.
Tormod triggers, creating a 2/2 Zombie creature token.
Repeat.

Infinite card draw

Infinite draw triggers

Near-infinite death triggers

Near-infinite creature ETB

Near-infinite lifeloss

Near-infinite creature LTB

Near-infinite creature sacrifice triggers

Tormod, the Desecrator

Priest of Forgotten Gods

Thornbite Staff

Reassembling Skeleton

Activate Priest of Forgotten Gods by tapping it, sacrificing Reassembling Skeleton and any other creature.
When Reassembling Skeleton and the other creature die, Priest of Forgotten Gods triggers twice, untapping Priest of Forgotten Gods.
Resolve the Priest of Forgotten Gods ability from step 1, causing any number of players to lose 2 life and sacrifice a creature, and you to add {B}{B} and draw a card.
Activate Reassembling Skeleton by paying {1}{B}, returning it from your graveyard to the battlefield.
Desecrated Tomb triggers, creating a 1/1 Bat creature token.
Repeat.

Desecrated Tomb

Activate Priest of Forgotten Gods by tapping it, sacrificing Reassembling Skeleton and any other creature.
When Reassembling Skeleton and the other creature die, Priest of Forgotten Gods triggers twice, untapping Priest of Forgotten Gods.
Resolve the Priest of Forgotten Gods ability from step 1, causing any number of players to lose 2 life and sacrifice a creature, and you to add {B}{B} and draw a card.
Activate Reassembling Skeleton by paying {1}{B}, returning it from your graveyard to the battlefield.
Skeleton Crew triggers, creating a 2/2 Skeleton Pirate creature token.
Repeat.

Skeleton Crew

Activate Priest of Forgotten Gods, sacrificing Relentless Dead and Gravecrawler.
Thornbite Staff, Pitiless Plunderer, and Relentless Dead trigger on the stack; resolve them in that order.
Untap Priest of Forgotten Gods with Thornbite Staff.
Pitiless Plunderer creates two Treasure tokens; crack them both to float two {B}.
Resolve Relentless Dead's trigger, paying {B} to recur it to hand.
Resolve Priest of Forgotten Gods' activated ability; draw a card and add two {B} (floating three {B}).
Cast Relentless Dead from your hand, then cast Gravecrawler from the graveyard as you control a Zombie.
Repeat the combo from the first step, draining opponent with each activation of Priest of Forgotten Gods and drawing your library.

Near-infinite storm count

Relentless Dead

Gravecrawler

Pitiless Plunderer

Activate Priest of Forgotten Gods by tapping it and sacrificing Gravecrawler and any other creature.
When the creatures die, Priest of Forgotten Gods triggers twice, untapping itself.
Resolve the Priest of Forgotten Gods ability, causing any number of opponents to sacrifice a creature and lose 2 life, and causing you to add {B}{B} and draw a card.
Cast Gravecrawler from your graveyard by paying {B}.
Tormod triggers, creating a 2/2 Zombie creature token.
Repeat.

Near-infinite black mana

Activate Priest of Forgotten Gods by tapping it, sacrificing Reassembling Skeleton and any other creature.
When Reassembling Skeleton and the other creature die, Priest of Forgotten Gods triggers twice, untapping Priest of Forgotten Gods.
Resolve the Priest of Forgotten Gods ability from step 1, causing any number of players to lose 2 life and sacrifice a creature, and you to add {B}{B} and draw a card.
Activate Reassembling Skeleton by paying {1}{B}, returning it from your graveyard to the battlefield.
Insidious Roots triggers, creating a 0/1 Plant creature token, and then putting a +1/+1 counter on each Plant you control.
Repeat.

Near-infinite +1/+1 counters on certain creatures

Insidious Roots

Cast Traitorous Greed by paying {3}{R}.
Forum Necroscribe triggers, returning Living Lightning from your graveyard to the battlefield.
Resolve Traitorous Greed, untapping Priest of the Forgotten Gods, giving it haste until end of turn, and adding {R}{R}.
Activate Priest of the Forgotten Gods by tapping it, sacrificing Living Lightning and any creature not part of the combo.
When Living Lightning dies, it and Bridge from Below triggers.
Resolve the Living Lightning trigger, returning Traitorous Greed from your graveyard to your hand.
Resolve the Bridge from Below trigger, creating a creature token.
Resolve the Priest of the Forgotten Gods ability, causing any number of opponents to sacrifice a creature and lose 2 life, adding {B}{B}, and drawing a card.
Repeat, sacrificing the newly created token in step 4 instead of the additional creature.

Combos with "Priest of Forgotten Gods"