Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $14.99 at Card Kingdom, near mint, their price list as of .
Brainstealer Dragon 
Creature — Dragon Horror · 6/6 · Rare · Commander Legends: Battle for Baldur's Gate · #621
Flying
At the beginning of your end step, exile the top card of each opponent's library. You may play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.
Whenever a nonland permanent an opponent owns enters the battlefield under your control, they lose life equal to its mana value.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 621 | Rare | $14.99 | — |
| Commander Legends: Battle for Baldur's Gate | 670 | Rare | $14.99 | — |
| Outlaws of Thunder Junction Commander | 127 | Rare | $14.99 | — |
| The List | OTC-127 | Rare | — | — |