Cheapest priced copy (Worldwake): $0.49 at Card Kingdom, near mint, their price list as of .
Smother 
Instant · Uncommon · World Championship Decks 2003 · #pk170
Destroy target creature with mana value 3 or less. It can't be regenerated.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $0.49 to $84.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Zendikar vs. Eldrazi | 57 | Uncommon | $0.59 | — |
| Friday Night Magic 2003 | 8 | Rare | — | $20.99Out of stock |
| Onslaught | 170 | Uncommon | $5.49 | $84.99 |
| World Championship Decks 2003 | pk170 | Uncommon | $1.99 | — |
| World Championship Decks 2003 | we170 | Uncommon | $1.49 | — |
| World Championship Decks 2003 | we170sb | Uncommon | $1.29 | — |
| Worldwake | 68 | Uncommon | $0.49 | $2.49 |
3 rulings from Wizards of the Coast
- 1 March 2010A token has a mana value of 0, unless it is copying something else.
- 1 March 2010A creature's mana value is determined solely by the mana symbols printed in its upper right corner (unless that creature is copying something else; see below). If its mana cost includes {X}, X is considered to be 0. If it has no mana symbols in its upper right corner (because it's an animated land, for example), its mana value is 0. Ignore any alternative costs or additional costs (such as kicker) paid when the creature was cast.
- 1 March 2010If a creature is copying something else, its mana value is the mana value of whatever it's copying.