Vampire Takeover

If you have no card in your Field Zone and all face-up monsters you control (min. 1) are Zombie-Type: Activate 1 "Vampire Kingdom" directly from your Deck, then, you can Special Summon 1 DARK "Vampire" monster from your Graveyard in face-up Defense Position. You can only activate 1 "Vampire Takeover" per turn.