Elminster is a mythic Legendary Planeswalker — Elminster card from Battle for Baldur's Gate Promos (PCLB), collector number 274s. Current market price: — (foil $11.22), TCGplayer market prices via Scryfall.
Whenever you scry, the next instant or sorcery spell you cast this turn costs {X} less to cast, where X is the number of cards looked at while scrying this way. +2: Draw a card, then scry 2. −3: Exile the top card of your library. Create a number of 1/1 blue Faerie Dragon creature tokens with flying equal to that card's mana value. Elminster can be your commander.