Pay 800 LP; choose 1 "Exosister" monster from your Deck, then take 1 other "Exosister" monster from your Deck that is mentioned on that monster, and Special Summon both, but shuffle them into the Deck during the End Phase, also for the rest of this turn after this card resolves, you cannot Special Summon monsters from the Extra Deck, except "Exosister" monsters. You can only activate 1 "Exosister Vadis" per turn.