Revolution Synchron (Quarter Century Secret Rare) (DUNE-EN002) - Duelist Nexus 1st Edition Number_MAZE-EN049 You can only use this

You can only use this effect of “Sinister Serpent” once per turn

Card TextThis monster stuns its enemies with a massive beak and ear-piercing wails

except "FaSolfachord Fancia"

"Neo Space"

Gains 500 ATK for each monster your opponent controls

Revolution Synchron (Quarter Century Secret Rare) (DUNE-EN002) - Duelist Nexus 1st Edition Number_MAZE-EN049 You can only use thisTypeMachine Effect Tuner Monster AttributeEARTH Level Rank3 ATK DEF900 1400 Card TextIf you Synchro Summon a "Power Tool" monster or a Level 7 or 8 Dragon monster, this card in your hand can also be used as material. You can only use this effect of "Revolution Synchron" once per turn. If you control a Level 7 or higher Synchro Monster while this card is in your GY: You can send the top card of your Deck to the GY, and if you do, Special Summon this