so yeah a new Rank-UP.... Oh wait a Rank-Down actually.... and a Quick-Play. Even better....
Activate only when a face up "Number C" or "CXyz" monster you control is targeted for an attack. Target one "Number C" or "Cxyz" monster you control; special summon from your extra deck one Xyz monster with the same Type as that monster, but one Rank lower, by using it as the Xyz material. (Xyz materials attached to that monster become Xyz materials on the summoned monster) Then if possible, target one Spell/Trap card your opponent controls; return it to the hand.
So yeah... tell me what you think... as always, CnC is greatly appreciated..