Nixis, Summer's Flame

At the beginning of your end step deal X damage
to target blue or black permanent an opponent
controls or gain X life where is the amount of
non-blue non-black non-snow permanents
you control.
Nixis has -X -X where X is the amount of
blue or black permanent's on the battlefield.
Nixis is the Mranni's general of battle, burning
Frost-Horns down like a flame to a forest.