Cheapest priced copy (Commander Masters): $9.49 at Card Kingdom, near mint, their price list as of .
Battle at the Helvault 
Enchantment — Saga · Rare · Commander Masters · #719
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — For each player, exile up to one target non-Saga, nonland permanent that player controls until this Saga leaves the battlefield.
III — Create Avacyn, a legendary 8/8 white Angel creature token with flying, vigilance, and indestructible.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $9.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 719 | Rare | $9.49 | — |
3 rulings from Wizards of the Coast
- 28 July 2023If a token is exiled this way, it will cease to exist and won't return to the battlefield.
- 28 July 2023Auras attached to the exiled permanents will be put into their owners' graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled permanents will cease to exist. When the cards return to the battlefield, they will be new objects with no connection to the cards that were exiled.
- 28 July 2023If Battle at the Helvault leaves the battlefield before its first or second chapter ability resolves, the target permanents won't be exiled.