Cheapest priced copy (Commander 2015): $9.49 at Card Kingdom, near mint, their price list as of .
Thief of Blood 
Creature — Vampire · 1/1 · Uncommon · Commander Anthology · #71
Flying
As this creature enters, remove all counters from all permanents. This creature enters with a +1/+1 counter on it for each counter removed this way.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $9.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2015 | 22 | Uncommon | $9.49 | — |
| Commander Anthology | 71 | Uncommon | $9.49 | — |
2 rulings from Wizards of the Coast
- 4 November 2015If more than one Thief of Blood enters the battlefield at the same time, you can apply the replacement effect of any of them. That one will enter with additional +1/+1 counters due to its own ability and the others will not.
- 4 November 2015Experience counters aren't removed from players this way, but loyalty counters are removed from planeswalkers.