Cheapest priced copy (Darksteel): $0.35 at Card Kingdom, near mint, their price list as of .
Psychic Overload 
Enchantment — Aura · Uncommon · Darksteel · #28
Enchant permanent
When this Aura enters, tap enchanted permanent.
Enchanted permanent doesn't untap during its controller's untap step.
Enchanted permanent has "Discard two artifact cards: Untap this permanent."
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Darksteel | 28 | Uncommon | $0.35 | $0.49 |