Cast Feign Death by paying {B}, targeting Living Lightning.
Activate Phyrexian Altar by sacrificing Living Lightning, adding {B}.
When Living Lightning dies, it triggers twice.
Resolve the first trigger, returning Feign Death from your graveyard to your hand.
Resolve the second trigger, returning it from your graveyard to the battlefield.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite magecraft triggers

Infinite creature sacrifice triggers

Infinite storm count

Feign Death

Phyrexian Altar

Living Lightning

Cast Supernatural Stamina by paying {B}, targeting Living Lightning.
Activate Phyrexian Altar by sacrificing Living Lightning, adding {B}.
When Living Lightning dies, it triggers twice.
Resolve the first trigger, returning Supernatural Stamina from your graveyard to your hand.
Resolve the second trigger, returning it from your graveyard to the battlefield.
Repeat.

Supernatural Stamina

Cast Undying Malice by paying {B}, targeting Living Lightning.
Activate Phyrexian Altar by sacrificing Living Lightning, adding {B}.
When Living Lightning dies, it triggers twice.
Resolve the first trigger, returning Undying Malice from your graveyard to your hand.
Resolve the second trigger, returning it from your graveyard to the battlefield.
Repeat.

Undying Malice

Cast Graceful Reprieve by paying {W}, targeting Living Lightning.
Activate Phyrexian Altar by sacrificing Living Lightning, adding {W}.
When Living Lightning dies, it and Graceful Reprieve trigger.
Resolve the Living Lightning trigger, returning Graceful Reprieve from your graveyard to your hand.
Resolve the Graceful Reprieve trigger, returning Living Lightning from your graveyard to the battlefield.
Repeat.

Graceful Reprieve

Cloud Key

Pearl Medallion

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 "Living Lightning"