Chthonian Nightmare and Patron of the Arts on the battlefield.
You have at least ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) .
You control at least two lands that can tap to produce at least ({2} magic symbol) .
Steps
Activate up to two lands by tapping them, adding at least ({2} magic symbol) .
Activate Chthonian Nightmare by paying ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) , sacrificing Patron of the Arts and returning Chthonian Nightmare from the battlefield to your hand.
When Patron of the Arts dies, it triggers, creating a Treasure token.
Resolve the Chthonian Nightmare ability, returning Cloud of Faeries from your graveyard to the battlefield.
When Cloud of Faeries enters the battlefield, it triggers, untapping up to two lands.
Activate the Treasure by tapping and sacrificing it, adding ({B} magic symbol) .
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) .
Activate Chthonian Nightmare by paying ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) , sacrificing Cloud of Faeries and returning Chthonian Nightmare from the battlefield to your hand, returning Patron of the Arts from your graveyard to the battlefield.
When Patron of the Arts enters the battlefield, it triggers, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding ({B} magic symbol) .