Pyretic Ritual in hand or in your graveyard or in your library.
Invasion of Arcavios // Invocation of the Founders and Displacer Kitten on the battlefield.
({1} magic symbol) ({R} magic symbol) available.
Steps
Cast Seething Song by paying ({2} magic symbol) ({R} magic symbol) .
Displacer Kitten triggers, blinking Invasion of Arcavios.
When Invasion of Arcavios enters the battlefield, it triggers, searching your library and/or graveyard for Pyretic Ritual and putting it into your hand.