Displacer Kitten | Invasion of Arcavios // Invocation of the Founders | Rite of Flame

(and one other card)

Instant/Sorcery with Mana Cost =

Rite of Flame in hand.
Instant/Sorcery with Mana Cost = ({R} magic symbol) in hand or in your graveyard or in your library.
Displacer Kitten and
Invasion of Arcavios // Invocation of the Founders on the battlefield.

Cast
Rite of Flame by paying ({R} magic symbol) .
Displacer Kitten triggers, blinking
Invasion of Arcavios.
When
Invasion of Arcavios enters the battlefield, it triggers, searching your library or graveyard for another instant or sorcery with mana cost equal to ({R} magic symbol) and putting it into your hand.
Resolve
Rite of Flame, adding ({R} magic symbol) ({R} magic symbol) .
Cast the other instant or sorcery by paying ({R} magic symbol) .
Displacer Kitten triggers, blinking
Invasion of Arcavios.
When
Invasion of Arcavios enters the battlefield, it triggers, returning
Rite of Flame from your graveyard to your hand.
Resolve the other instant or sorcery spell.
Repeat.

Infinite casts of the other instant or sorcery with mana cost equal to ({R} magic symbol) .
Infinite magecraft triggers.
Infinite storm count.