Fiendsmith in Paradise

“Target 1 Level 7 or higher LIGHT Fiend monster you control; send all cards on the field to the GY that are not that monster. If your opponent Special Summons a monster(s), while this card is in your GY: You can banish this card; send 1 "Fiendsmith" monster from your Deck or Extra Deck to the GY. You can only use each effect of "Fiendsmith in Paradise" once per turn.”