You control a nontoken creature that can be cast using one colored mana.
Steps
Activate
Evereth by sacrificing the nontoken creature.
When the creature dies,
Mortuary and
Pitiless Plunderer trigger.
Resolve the
Mortuary trigger, putting the creature from your graveyard onto the top of your library.
Resolve the
Pitiless Plunderer trigger, creating a Treasure token.
Resolve the
Evereth ability.
Activate the Treasure by tapping and sacrificing it, adding one mana of any color.
Cast the creature from the top of your library by paying its mana cost.
Repeat.
Notes
If you have a way to kill
Evereth and ({1} magic symbol) ({BR} magic symbol) available, you can do so after putting a significant amount of +1/+1 counters on it to deal damage to each opponent using its second ability.
Results
Infinite +1/+1 counters on a creature.
Infinite artifact ETB.
Infinite artifact LTB.
Infinite artifact sacrifice triggers.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite storm count.
Infinite damage.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).