Cheapest priced copy (The List): $3.99 at Card Kingdom, near mint, their price list as of .
Workhorse 
Artifact Creature — Horse · 0/0 · Rare · The List · #EXO-142
This creature enters with four +1/+1 counters on it.
Remove a +1/+1 counter from this creature: Add {C}.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper