Cheapest priced copy (Guilds of Ravnica): $0.49 at Card Kingdom, near mint, their price list as of .
Ral's Dispersal 
Instant · Rare · Guilds of Ravnica · #266
Return target creature to its owner's hand. You may search your library and/or graveyard for a card named Ral, Caller of Storms, reveal it, and put it into your hand. If you search your library this way, shuffle.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 266 | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 5 October 2018If the target creature becomes an illegal target for Ral’s Dispersal, the spell doesn’t resolve. You don’t search for Ral, Caller of Storms.