You have at least ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) .
You control a nontoken creature with mana value 3 or less.
Steps
Activate
Chthonian Nightmare by paying ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) , sacrificing a creature with mana value 3 or less and returning
Chthonian Nightmare from the battlefield to your hand.
When the creature dies,
Pitiless Plunderer triggers, creating a Treasure token.
Resolve the
Chthonian Nightmare ability, returning
Priest of Gix from your graveyard to the battlefield.
When
Priest of Gix enters the battlefield, it triggers, adding ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Activate the Treasure by tapping and sacrificing it, adding ({1} magic symbol) .