Cheapest priced copy (Betrayers of Kamigawa): $2.49 at Card Kingdom, near mint, their price list as of .
Shining Shoal 
Instant — Arcane · Rare · Betrayers of Kamigawa · #21
You may exile a white card with mana value X from your hand rather than pay this spell's mana cost.
The next X damage that a source of your choice would deal to you and/or creatures you control this turn is dealt to any target instead.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $2.49 to $17.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Betrayers of Kamigawa | 21 | Rare | $2.49 | $17.99 |
2 rulings from Wizards of the Coast
- 1 February 2005The redirection protects both you and your creatures from the source. If the source would deal more than X damage to multiple objects, you decide which damage is redirected until X is used up. For example, your opponent casts a spell that deals 1 damage to you and 1 damage to two of your creatures. If you cast Shining Shoal with X = 2, you can have damage to you and one creature redirected to the target, or you could have damage to both creatures redirected.
- 1 February 2005If the player or creature that was targeted is no longer playing or on the battlefield when the damage would occur, the damage isn’t redirected.