Mnemonic Betrayal [Guilds of Ravnica] Synth {4}{R}{G}: Radha gets +X/+X until

{4}{R}{G}: Radha gets +X/+X until end of turn

and a black creature: Search your library for a card named Sphinx Sovereign and put it onto the battlefield

you may return target Spirit card with converted mana cost 5 or less from your graveyard to your hand

then caverns

Mnemonic Betrayal [Guilds of Ravnica] Synth {4}{R}{G}: Radha gets +X/+X untilSet: Guilds of Ravnica Type: Sorcery Rarity: 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.