Send 1 face-up monster you control to the Graveyard; Special Summon from your Deck, 1 monster with the same Type and Attribute as that monster in the Graveyard, but 1 Level higher. You can only activate 1 "Transmodify" per turn.
Can you use this if the level of the monster has been changed? say I used Magical Something in a spell book deck it's level has increased from 4 to 7 can I use transmodify to summon Dark Magician of Chaos? they're both Dark and Spellcaster.