Tharion, Lord of Demons

Tharion, Lord of Demons costs {1} less for
each Demon or Dragon you control.
Flying, Vigilance, Trample, Infect, Double strike
{2}{b}{r},{t} Put a -2/-2 counter on target creature
or remove 1 loyalty from target planeswalker.
Tharion, Lord of Demons can be your
commander.