2 or more (max: 5) Level X monsters (X is any number from 1 to 12.)
This Xyz Summoned card's Rank is equal to X. This card gains ATK and DEF are equal to its Rank x400. Once per turn: You can send 1 Xyz Monster from your Extra Deck to the Graveyard; this card gains Ranks equal to the Rank of the sent monster, until the End Phase. When this card battles an Xyz Monster: You can detach 1 Xyz Material from this card; it gains Ranks equal to the Rank of the attack target. When this card destroys an opponent's Xyz Monster, with Xyz Materials, by battle and sent to the Graveyard: You can target 1 monster from either player's Graveyard that was sent here either because it was detached as an Xyz Material for the effect of the destroyed monster OR sent there because it was the Xyz Material for the destroyed monster when destroyed: Attach it to this card as an Xyz Material. If this card is destroyed by battle and sent to the Graveyard: You can target up to 2 Xyz Monsters from the Graveyard; Special Summon them. Once per Duel, while this card is in the Graveyard: You can target 2 or more monsters you control who do not have Levels; their Levels become 4, until the End Phase, then shuffle this card from the Graveyard to the Extra Deck. You can only Xyz Summon 1 "Phantom Slime" once per turn.