Ninjitsu Art of Super-Transformation

Activate this card by targeting 1 "Ninja" monster you control and 1 face-up monster your opponent controls; send them to the Graveyard, then Special Summon 1 Dragon, Dinosaur, or Sea Serpent-Type monster from your Deck whose Level is less than or equal to the combined original Levels of the sent monster(s). When this card leaves the field, banish that monster.