Cheapest priced copy (Magic Origins): $0.99 at Card Kingdom, near mint, their price list as of .
Displacement Wave 
Sorcery · Rare · Magic Origins · #55
Return all nonland permanents with mana value X or less to their owners' hands.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.99 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic Origins | 55 | Rare | $0.99 | $1.99 |
2 rulings from Wizards of the Coast
- 22 June 2015If a permanent has an {X} in its mana cost, that X is 0.
- 22 June 2015A token has mana value 0 unless it's a copy of something else, in which case it has the mana cost of whatever it's copying.