SkekSo, the Emperor

All effects dealt to SkekSo are also dealt to UrSu.
(If SkekSo is put into the graveyard, destroy UrSu.)
Menace, Partner with UrSu, the Master
{2}: Place a darkening counter on SkekSo. (If this
creature has ten or more darkening counters, it must
be destroyed.)
Remove X darkening counters: SkekSo deals X
damage to target creature or player.