Xanathar, Guild Kingpin [Dungeons & Dragons: Adventures in the Forgotten Realms Prerelease Promos] Sorcery Then that player loses all

Then that player loses all unspent mana and you add the mana lost this way

[Auto] [Once per turn] When your opponent activates a [Counter:Attack] skill

"Vine-wreathed

the crime lord is often described as heartless

shuffle it into its owner's library

Xanathar, Guild Kingpin [Dungeons & Dragons: Adventures in the Forgotten Realms Prerelease Promos] Sorcery Then that player loses allSet: Dungeons & Dragons: Adventures in the Forgotten Realms Prerelease Promos Type: Legendary Creature Beholder Rarity: Mythic Cost: {4}{U}{B} At the beginning of your upkeep, choose target opponent. Until end of turn, that player can't cast spells, you may look at the top card of their library any time, you may play the top card of their library, and you may spend mana as though it were mana of any color to cast spells this way.