Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $2.99 at Card Kingdom, near mint, their price list as of .
Elminster 
Legendary Planeswalker — Elminster · Mythic · Commander Legends: Battle for Baldur's Gate · #274
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $2.99 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 274 | Mythic | $2.99 | $3.49Out of stock |
| Commander Legends: Battle for Baldur's Gate | 362 | Mythic | $2.99Out of stock | $7.99Out of stock |
| Battle for Baldur's Gate Promos | 274s | Mythic | — | $11.99 |