Cheapest priced copy (Explorers of Ixalan): $19.99 at Card Kingdom, near mint, their price list as of .
Beacon of Immortality 
Instant · Rare · Fifth Dawn · #6
Double target player's life total. Shuffle Beacon of Immortality into its owner's library.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $19.99 to $64.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 10 | Rare | $20.99 | $64.99 |
| Fifth Dawn | 6 | Rare | $20.99 | $49.99 |
| Explorers of Ixalan | 1 | Rare | $19.99 | — |
| The List | E02-1 | Rare | $19.99 | — |
3 rulings from Wizards of the Coast
- 1 February 2007If you double a negative life total, you do the real math. A life total of -10 becomes -20.
- 15 July 2007If a Beacon is countered or doesn’t resolve, it’s put into its owner’s graveyard, not shuffled into the library.
- 15 July 2007Beacon of Immortality’s effect counts as life gain (or life loss, if the life total was negative) for effects that trigger on or replace life gain (or life loss).