Cheapest priced copy (Wilds of Eldraine: Enchanting Tales): $3.49 at Card Kingdom, near mint, their price list as of .
Prismatic Omen 
Enchantment · Rare · Shadowmoor · #126
Lands you control are every basic land type in addition to their other types.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $3.49 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadowmoor | 126 | Rare | $5.99 | $37.99 |
| Secret Lair Drop | 1104 | Rare | $9.49 | $10.99 |
| Wilds of Eldraine: Enchanting Tales | 60 | Rare | $3.49 | $3.49 |
2 rulings from Wizards of the Coast
- 1 May 2008Each land you control will have the land types Plains, Island, Swamp, Mountain, and Forest. They’ll also have the mana ability of each basic land type (for example, Forests can tap to produce {G}). They’ll still have their other subtypes and abilities.
- 1 May 2008Giving a land extra basic land types doesn’t change its name or whether it’s legendary or basic.