Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Displacer Kitten + Vampire Hexmage + Corpse Dance + Cloud Key

Invasion of Segovia // Caetus, Sea Tyrant of Segovia

Displacer Kitten

Vampire Hexmage

Corpse Dance

Cloud Key

How it works

1. Cast Corpse Dance with buyback by tapping Caetus, Vampire Hexmage and two other creatures you control.
2. Displacer Kitten triggers, blinking Caetus and causing it to return to the battlefield as Invasion of Segovia.
3. When Invasion of Segovia enters the battlefield, it triggers, creating two 1/1 Kraken creature tokens.
4. Activate Vampire Hexmage by sacrificing it, removing all counters from Invasion of Segovia.
5. Invasion of Segovia triggers, causing you to exile it and cast it as Caetus, Sea Tyrant of Segovia.
6. Resolve Corpse Dance, returning Vampire Hexmage from your graveyard to the battlefield and returning Corpse Dance to your hand.
7. Repeat.

This intricate loop relies on Cloud Key naming "instant" to slash Corpse Dance’s cost to a single black mana, which is easily paid using the convoke granted to noncreature spells by Invasion of Segovia (or its back face, Caetus, Sea Tyrant of Segovia). Each time you cast Corpse Dance, Displacer Kitten triggers to blink your current Siege, resetting it so that every iteration churns out fresh Kraken tokens and clears out its defense counters via the sacrifice of Vampire Hexmage. This triggers the Siege to flip back into Caetus, and because Corpse Dance conveniently returns Vampire Hexmage from the graveyard while buying itself back to your hand, you have a self-sustaining engine of endless rebirths.