Cheapest priced copy (March of the Machine Commander): $11.99 at Card Kingdom, near mint, their price list as of .
Shalai and Hallar 
Legendary Creature — Angel Elf · 3/3 · Mythic · March of the Machine Commander · #96
Flying, vigilance
Whenever one or more +1/+1 counters are put on a creature you control, Shalai and Hallar deals that much damage to target opponent.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $7.99 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine Commander | 10 | Mythic | $11.99 | $7.99 |
| March of the Machine Commander | 96 | Mythic | $12.99 | $15.99 |