Cheapest priced copy (Commander Legends): $0.49 at Card Kingdom, near mint, their price list as of .
Bell Borca, Spectral Sergeant 
Legendary Creature — Spirit Soldier · */5 · Rare · Dominaria United Commander · #145
Note the mana value of each card as it's put into exile.
Bell Borca's power is equal to the greatest number noted for it this turn.
At the beginning of your upkeep, exile the top card of your library. You may play that card this turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 271 | Rare | $0.49 | $0.49 |
| Commander Legends | 591 | Rare | — | — |
| Dominaria United Commander | 145 | Rare | $0.49 | — |
7 rulings from Wizards of the Coast
- 10 November 2020You'll still pay all costs for a spell cast this way, including additional costs. You may also pay alternative costs if any are available.
- 10 November 2020If a card in exile has {X} in its mana cost, X is considered to be 0.
- 10 November 2020You must follow the normal timing permissions and restrictions for the card exiled by Bell Borca's last ability. If it's a land, you can't play it unless you have land plays available.
- 10 November 2020If you don't play the exiled card, it remains exiled.
- 10 November 2020Look at the card in exile, not its previous zone, to determine its mana value.
- 10 November 2020While not on the battlefield, and before any cards are noted for it each turn, Bell Borca's power is 0.
- 10 November 2020Bell Borca notes mana values only if it's on the battlefield as a card is put into exile.