Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Rally of Wings 
Instant · Uncommon · War of the Spark · #27
Untap all creatures you control. Creatures you control with flying get +2/+2 until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 238 | Uncommon | $0.35 | — |
| Starter Commander Decks | 30 | Uncommon | $0.35 | — |
| War of the Spark | 27 | Uncommon | $0.35 | $1.99 |
One ruling from Wizards of the Coast
- 3 May 2019Rally of Wings affects only creatures you control at the time it resolves. Creatures that gain flying later in the turn or that you begin to control later in the turn won't get +2/+2.