Demon's Resonance

Can be used by revealing 1 "Resonator" monster in your hand. Return 1 card from your hand to your Deck and add 1 Level 4 or lower Fiend-Type monster to your hand from your Deck. You cannot activate the effect of the added card or cards with the same name during this turn. This Skill will only activate if you begin the Duel with a Deck that has 10 or more "Resonator" cards or Fiend-Type monsters and an Extra Deck that only has Dragon-Type Synchro Monsters. This Skill can only be used once per turn and twice per Duel.