Armageddon Knight [PTDN-EN021] Super Rare Mouse Soldier You can only activate 1

You can only activate 1 "Spellbook of Secrets" per turn

Set: Sword & Shield: Black Star Promos Type: Fighting Rarity: Promo Retreat cost: 0

Set: World Championships 2005 Type: Colorless Rarity: Common Retreat cost: Colorless

Set: XY: BREAKthrough Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

you can substitute this card for any 1 "Synchron" Tuner monster

Armageddon Knight [PTDN-EN021] Super Rare Mouse Soldier You can only activate 1Set: Phantom Darkness Card type: Effect Monster Rarity: Super Rare Attack: 1400 Defense: 1200 When this card is Summoned, you can send 1 DARK monster from your Deck to the Graveyard.