Mnemonic Betrayal [Guilds of Ravnica] Planechase Planes where X is the number

where X is the number of Allies you control

You and your teammates will travel across the globe

or Assassin

exile it instead of putting it into its owner's graveyard

−10: Target player's life total becomes 1

Mnemonic Betrayal [Guilds of Ravnica] Planechase Planes where X is the numberSet: Guilds of Ravnica Type: Sorcery Rarity: Mythic Cost: {1}{U}{B} Exile all opponents' graveyards. You may cast spells from among those cards this turn, and you may spend mana as though it were mana of any type to cast those spells. At the beginning of the next end step, if any of those cards remain exiled, return them to their owners' graveyards. Exile Mnemonic Betrayal.