Xanathar, Guild Kingpin (Ampersand Promo) [Dungeons & Dragons: Adventures in the Forgotten Realms Promos] Unknown Event but I believe a more

but I believe a more mundane power source might suffice

Set: Kamigawa: Neon Dynasty Type: Legendary Land Rarity: Rare {T}: Add {U}

You have no maximum hand size for the rest of the game

untap Time Vault

Set: Streets of New Capenna Commander Promos Type: Creature — Rat Rarity: Rare Cost: {3}{B} Trample

Xanathar, Guild Kingpin (Ampersand Promo) [Dungeons & Dragons: Adventures in the Forgotten Realms Promos] Unknown Event but I believe a moreSet: 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.