Cheapest priced copy (Modern Horizons 2): $0.35 at Card Kingdom, near mint, their price list as of .
Monoskelion 
Artifact Creature — Construct · 1/1 · Uncommon · Modern Horizons 2 · #229
This creature enters with a +1/+1 counter on it.
{1}, Remove a +1/+1 counter from this creature: It deals 1 damage to any target.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 2 | 229 | Uncommon | $0.35 | $0.49 |
| Modern Horizons 2 | 429 | Uncommon | $0.35 | $0.49 |