Rakdos, the Muscle | Priest of Gix | Haunted Crossroads

(and one other card)

Activate
Phyrexian Altar by sacrificing
Priest of Gix, adding ({B} magic symbol) .
When
Priest of Gix dies,
Rakdos triggers.
Holding priority, activate
Haunted Crossroads by paying ({B} magic symbol) , putting
Priest of Gix from your graveyard onto the top of your library.
Resolve the
Rakdos trigger, causing you to exile the top three cards of your library with the ability to play them until your next end step.
Cast
Priest of Gix from exile by paying ({3} magic symbol) .
When
Priest of Gix enters the battlefield, it triggers, adding ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Repeat.

Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite storm count.
Exile your library with the ability to play the exiled cards until your next turn.