Voltaic Key [Urza's Saga] San Diego Comic-Con 2014 Set: Labyrinth of Nightmare Card

Set: Labyrinth of Nightmare Card type: Normal Trap Rarity: Super Rare Attack: 0 Defense: 0 Activate only when an opponent's monster declares an attack

When Ancestral Knowledge enters the battlefield

all other Synchro Material Monsters must all be WATER

Set: EX: Crystal Guardians Type: Fire Rarity: Common Retreat cost: Colorless

Set: 2005 Collectors Tin Card type: Effect Monster Rarity: Secret Rare Attack: 2000 Defense: 1700 Increase the ATK of this card by 300 for each "Dark Magician" or "Magician of Black Chaos" in either player's Graveyard

Voltaic Key [Urza's Saga] San Diego Comic-Con 2014 Set: Labyrinth of Nightmare CardSet: Urza's Saga Type: Artifact Rarity: Uncommon Cost: {1} {1}, {T}: Untap target artifact. The key did not work on a single lock, yet it opened many doors.