Cheapest priced copy (Commander Legends): $1.79 at Card Kingdom, near mint, their price list as of .
Stumpsquall Hydra 
Creature — Hydra · 1/1 · Rare · Commander Legends · #367
When this creature enters, distribute X +1/+1 counters among it and any number of commanders.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 367 | Rare | $1.79 | — |
4 rulings from Wizards of the Coast
- 10 November 2020If Stumpsquall Hydra leaves the battlefield before its triggered ability resolves, you can still distribute the counters among any number of commanders, including none of them.
- 10 November 2020Because Stumpsquall Hydra's ability doesn't target, you choose how to distribute X +1/+1 counters as its ability resolves. Players can't take actions between the time you decide this distribution and the time counters are put on the appropriate permanents.
- 10 November 2020You can't put +1/+1 counters on commanders that aren't on the battlefield.
- 10 November 2020You may put +1/+1 counters on commanders that aren't currently creatures (such as Tevesh Szat, Doom of Fools).