Cheapest priced copy (Eventide): $0.99 at Card Kingdom, near mint, their price list as of .
Evershrike 
Creature — Elemental Spirit · 2/2 · Rare · Eventide · #88
Flying
This creature gets +2/+2 for each Aura attached to it.
{X}{W/B}{W/B}: Return this card from your graveyard to the battlefield. You may put an Aura card with mana value X or less from your hand onto the battlefield attached to it. If you don't, exile this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.99 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eventide | 88 | Rare | $0.99 | $11.99 |
4 rulings from Wizards of the Coast
- 1 August 2008You can't put an Aura onto the battlefield this way unless that Aura can legally be attached to Evershrike. For example, you can't put an Aura card with "enchant player" onto the battlefield this way.
- 1 August 2008You can activate Evershrike's ability with X = 0. If you do, you'll return Evershrike to the battlefield from your graveyard, then exile it. (There are no Aura cards with mana value 0.)
- 1 August 2008You can activate Evershrike's ability only while it's in your graveyard.
- 1 August 2008You can activate Evershrike's ability even if you have no Auras in your hand, or if you have an Aura in your hand that you don't want to put on it or can't put on it. In either case, you'll return Evershrike to the battlefield from your graveyard, then exile it. No player has the opportunity to cast spells or activate abilities while Evershrike is on the battlefield.