Can be used if you only control 1 DARK Dragon-Type Synchro Monster with 3000 or more ATK. Return 1 card from your hand to your Deck and play 1 Level 4 or lower Tuner monster from your Graveyard in Defense Position, but negate its effects. If the monster you control is "Red Dragon Archfiend", you can select up to 2 monsters to play when using this Skill.
Monster(s) played with this Skill cannot be Tributed, and during the turn you use this Skill, you cannot Normal or Special Summon any monsters except Synchro Monsters that list a Synchro Monster as material.
This Skill can only be used if you begin the Duel with a Deck that contains no Tuner monsters other than "Resonator" monsters. (Extra Deck does not count.) This Skill can be used once per Duel.
Oh, I guess you're having problems with your internet connection. It is required to download the game.
With all those conditions and restrictions, I expect this skill to summon Resonators from the deck instead of the graveyard. I’m not even mentioning how it kills your consistency if you choose this skill over Demon’s Resonance. Garbage skill.