Cheapest priced copy (Ravnica Allegiance): $0.35 at Card Kingdom, near mint, their price list as of .
Senate Courier 
Creature — Bird · 1/4 · Common · Ravnica Allegiance · #50
Flying
{1}{W}: This creature gains vigilance until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica Allegiance | 50 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 25 January 2019Gaining vigilance any time after the moment you choose to attack with a creature won't cause it to become untapped.