Xanathar, Guild Kingpin (Ampersand Promo) [Dungeons & Dragons: Adventures in the Forgotten Realms Promos] Base Set 1st Edition This mana can't be spent

This mana can't be spent to pay generic mana costs

Set: Kaldheim Promos Type: Legendary Planeswalker — Tyvar Rarity: Mythic Cost: {2}{G}{G} Elves you control have "{T}: Add {B}

Set: Foreign Black Border Type: Artifact Rarity: Rare Cost: {2} At the beginning of each player's draw step

Set: Kaladesh Inventions Type: Legendary Artifact Rarity: Mythic Cost: {6} {8}

if it wasn't cast

Xanathar, Guild Kingpin (Ampersand Promo) [Dungeons & Dragons: Adventures in the Forgotten Realms Promos] Base Set 1st Edition This mana can't be spentSet: Dungeons & Dragons: Adventures in the Forgotten Realms 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.