Cheapest priced copy (Time Spiral): $0.35 at Card Kingdom, near mint, their price list as of .
Thunder Totem 
Artifact · Uncommon · Time Spiral · #265
{T}: Add {W}.
{1}{W}{W}: This artifact becomes a 2/2 white Spirit artifact creature with flying and first strike until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Time Spiral | 265 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 August 2008A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.