Stumpsquall Hydra

Creature — Hydra

When Stumpsquall Hydra enters the battlefield, distribute X +1/+1 counters among it and any number of commanders.

1/1

2020-11-10:
Because 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.
2020-11-10:
You can’t put +1/+1 counters on commanders that aren’t on the battlefield.
2020-11-10:
You may put +1/+1 counters on commanders that aren’t currently creatures (such as Tevesh Szat, Doom of Fools).
2020-11-10:
If 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.