Synchro Overtop - Duelist Nexus (DUNE)

Target any number of Level 7 or 8 Dragon Synchro Monsters in your GY; Special Summon them in Defense Position, but their Levels become 1 and their effects are negated, also you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Synchro Monsters. When a Synchro Monster you control is destroyed by battle: You can banish this card from your GY; Special Summon 1 "Crimson Dragon" from your Extra Deck. You can only use each effect of "Synchro Overtop" once per turn.