Thief of Sanity [Guilds of Ravnica Prerelease Promos] 15th Anniversary Synchro Monsters' effects are negated

Synchro Monsters' effects are negated

Set: Force of the Breaker Card type: Normal Spell Rarity: Ultimate Rare Activate only when there are 2 or more "Crystal Beast" cards in your Spell & Trap Card Zone

during either player's turn: You can detach 1 Xyz Material from this card

you can select 1 face-up monster on your opponent's side of the field

Thief of Sanity [Guilds of Ravnica Prerelease Promos] 15th Anniversary Synchro Monsters' effects are negatedSet: Guilds of Ravnica Prerelease Promos Type: Creature Specter Rarity: Rare Cost: {1}{U}{B} Flying Whenever Thief of Sanity deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may look at and cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell.