Mnemonic Betrayal [Guilds of Ravnica] Eldrazi Set: Arena League 1999 Type:

Set: Arena League 1999 Type: Instant Rare Cost: {2}{U}{U} Counter target spell

Whenever you cast a Zombie spell

But where is the source

Set: Tempest Type: Creature — Elemental Rare Cost: {5}{G}{G}{G} At the beginning of each upkeep

Mnemonic Betrayal [Guilds of Ravnica] Eldrazi Set: Arena League 1999 Type:Set: Guilds of Ravnica Type: Sorcery Mythic Cost: {1}{U}{B} Exile all cards from 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.