Cheapest priced copy (Mirage): $0.35 at Card Kingdom, near mint, their price list as of .
Crystal Golem 
Artifact Creature — Golem · 3/3 · Uncommon · Mirage · #298
At the beginning of your end step, this creature phases out. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirage | 298 | Uncommon | $0.35 | — |