Heavy Interlock

This card is used to Ritual Summon "Borreload Riot Dragon". You must also Tribute monsters from your hand or field, and/or destroy "Rokket" monsters from your hand or face-up field, whose total Levels equal 8 or more. The monster Special Summoned by this effect cannot be destroyed by battle with a monster Special Summoned from the Extra Deck, and is unaffected by the activated effect of any monster Special Summoned from the Extra Deck.