Cheapest priced copy (Iconic Masters): $0.59 at Card Kingdom, near mint, their price list as of .
Guardian Idol 
Artifact · Uncommon · Foundations Jumpstart · #753
This artifact enters tapped.
{T}: Add {C}.
{2}: This artifact becomes a 2/2 Golem artifact creature until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
4 printings · $0.59 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Dawn | 128 | Uncommon | $0.69 | $3.99 |
| Iconic Masters | 216 | Common | $0.59 | $0.79 |
| Foundations Jumpstart | 753 | Uncommon | $0.59 | — |
| Jumpstart | 467 | Uncommon | $0.69 | — |
3 rulings 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.
- 17 November 2017If Guardian Idol has any +1/+1 counters on it, those counters will remain on it after it stops being a creature. Those counters will have no effect as long as Guardian Idol isn't a creature, but they will apply again if it later becomes a creature.
- 17 November 2017Activating the last ability of Guardian Idol while it's already a creature will override any effects that set its power or toughness to a specific value. Effects that modify power or toughness without setting them to a specific value will continue to apply.