Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $0.35 at Card Kingdom, near mint, their price list as of .
Candlekeep Inspiration 
Sorcery · Uncommon · Commander Legends: Battle for Baldur's Gate · #59
Until end of turn, creatures you control have base power and toughness X/X, where X is the number of cards you own in exile and in your graveyard that are instant cards, are sorcery cards, and/or have an Adventure.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 59 | Uncommon | $0.35 | $0.49 |
| The List | CLB-59 | Uncommon | — | — |
2 rulings from Wizards of the Coast
- 10 June 2022The value of X is locked in at the time that Candlekeep Inspiration resolves. The power and toughness of creatures affected by it will not change as cards enter and leave exile and/or your graveyard.
- 10 June 2022The set of creatures that Candlekeep Inspiration applies to is locked in as it resolves. Creatures that enter the battlefield under your control after it resolves will not be affected.