Cheapest priced copy (Aether Revolt): $0.35 at Card Kingdom, near mint, their price list as of .
Dawnfeather Eagle 
Creature — Bird · 3/3 · Common · Aether Revolt · #14†
Flying
When this creature enters, creatures you control get +1/+1 and gain vigilance until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aether Revolt | 14 | Common | $0.35 | $0.49 |
| Aether Revolt | 14† | Common | — | — |
2 rulings from Wizards of the Coast
- 9 February 2017Dawnfeather Eagle’s triggered ability affects itself.
- 9 February 2017The set of creatures affected by Dawnfeather Eagle’s triggered ability is determined as the ability resolves. Creatures you begin to control later in the turn and permanents you control that become creatures later in the turn won’t get +1/+1 or gain vigilance.