Name
Xanathar, Guild Kingpin (Extended Art)
Set Name
Adventures in the Forgotten Realms
Set Type
Expansion
Mana
Type Line
Legendary Creature — Beholder
Rarity
Mythic
Oracle Text
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.