Xanathar, Guild Kingpin [Dungeons & Dragons: Adventures in the Forgotten Realms Prerelease Promos] MON188-CF (Pay the card's mana cost:

(Pay the card's mana cost: Return it to the battlefield

"You will learn to earn death

Set: War of the Spark Promos Type: Legendary Planeswalker — Teferi Rarity: Rare Cost: {1}{W}{U} Each opponent can cast spells only any time they could cast a sorcery

you may pay [3 Resource] instead

Xanathar, Guild Kingpin [Dungeons & Dragons: Adventures in the Forgotten Realms Prerelease Promos] MON188-CF (Pay the card's mana cost:Set: 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.