Xyz Monsters you control gain 800 ATK. Once per turn: You can discard 1 Spell Card, then target 1 Xyz Monster you control; Xyz Summon 1 "Number C" or "CXyz" monster from your Extra Deck with the same Type as that monster but 1 Rank higher, using that monster as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.). If you discarded a non "Rank-Up-Magic" Spell Card, the monster Special Summoned by this effect returns to the Extra Deck during the End Phase.
