All creatures get -X/-X until end of turn, where X is the greatest mana value of a commander you own on the battlefield or in the command zone.
Mana cost
4
B
B
Mana value
6
Printings
From
$0.21
EDHREC rank
#16255
Buy
Formats
Legacy
Legal
Vintage
Legal
Commander
Legal
Rulings
10 Jun 2022
If your commander is under the control of another player as Cloudkill resolves, it is still on the battlefield and will still be used to determine the value of X.