Cheapest priced copy (Dominaria United): $0.49 at Card Kingdom, near mint, their price list as of .
Battlefly Swarm 
Creature — Phyrexian Insect · 1/1 · Common · Dominaria United · #81
Flying
{B}: This creature gains deathtouch until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria United | 81 | Common | $0.49 | $0.49 |