Mnemonic Betrayal [Guilds of Ravnica] Rivals of Ixalan Prerelease Promos {T}: Add {U} for each

{T}: Add {U} for each artifact you control

Activate only during your upkeep

you may tap or untap target permanent

Set: Portal Three Kingdoms Type: Creature — Boar Rarity: Uncommon Cost: {3}{B} Swampwalk (This creature can't be blocked as long as defending player controls a Swamp

Creatures those players control that can block additional creatures may likewise be put into additional piles

Mnemonic Betrayal [Guilds of Ravnica] Rivals of Ixalan Prerelease Promos {T}: Add {U} for eachSet: 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.