Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Puresight Merrow 
Creature — Merfolk Wizard · 2/2 · Uncommon · Shadowmoor · #146
{W/U}, {Q}: Look at the top card of your library. You may exile that card. ({Q} is the untap symbol.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | SHM-146 | Uncommon | $0.35 | — |
| Shadowmoor | 146 | Uncommon | $0.35 | $7.99 |
3 rulings from Wizards of the Coast
- 1 May 2008If a creature with an {Q} ability hasn’t been under your control since your most recent turn began, you can’t activate that ability, unless the creature has haste.
- 1 May 2008If the permanent is already untapped, you can’t activate its {Q} ability. That’s because you can’t pay the “Untap this permanent” cost.
- 1 May 2008When you activate an {Q} ability, you untap the creature with that ability as a cost. The untap can’t be responded to. (The actual ability can be responded to, of course.)