Luminous Dragon Ritual

This card is used to Ritual Summon "Paladin of Photon Dragon". You must also Tribute monsters from your hand or field whose total Levels equal exactly 4. You can banish this card from your Graveyard; banish monsters from your Graveyard whose total Levels equal exactly 4, and Special Summon 1 "Paladin of Photon Dragon" from your hand after that. (This Special Summon is treated as a Ritual Summon.)