Rank-Up-Magic

"Rank-Up Magic", abbreviated "RUM" is an archetype of Spells cards that supports Xyz Monsters by ranking up monsters through Chaos Xyz Evolution.

All "Rank-Up Magic" cards share the same lore: ''Target 1 face-up [archetype] you control; Xyz Summon 1 [archetype] monster with [number of] Rank(s) higher than that target, using it as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on the new Xyz Monster).''