Armor Dragon Ritual

This card is used to Ritual Summon "Knight of Armor Dragon". You must also Tribute monsters from your hand or field whose total Levels equal 4 or more. During your Main Phase, except the turn this card was sent to the GY: You can banish monsters from your hand or face-up field whose total Levels equal 4 or more; banish this card from your GY, and if you do, Special Summon 1 "Knight of Armor Dragon" from your GY. You can only use this effect of "Armor Dragon Ritual" once per turn.