Cheapest priced copy (Commander Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Mowu, Loyal Companion 
Legendary Creature — Dog · 3/3 · Uncommon · Commander Masters · #306
Vigilance, trample
If one or more +1/+1 counters would be put on Mowu, that many plus one +1/+1 counters are put on it instead.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 306 | Uncommon | $0.35 | $0.49 |
| Foundations Jumpstart | 79 | Uncommon | $0.35 | — |
| War of the Spark | 167 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 3 May 2019Because Mowu's replacement effect affects only Mowu, it will apply if Mowu somehow enters the battlefield with one or more +1/+1 counters on it and give Mowu an additional +1/+1 counter.