Kuerdnin & Chednin

Shroud
When Kuerdnin & Chednin enters the battlefield, all non-Sahkin creatures gets -2/-2 until end of turn.
Whenever a non-Sahkin creature your opponents control dies, he or she may pay {2}, if they don't, you may create a X/X white and black Sahkin creature token with Shroud where X was that creature's power.