Demon Lord, Thrastin

This card costs {1} less to cast for each Demon
or Dragon creature you control
Flying, Menace, Deathtouch, Haste
Grand Demon Summoner-Whenever
this creature enters the battlefield or attacks,
create 2 black 5/5 demon creature tokens with
flying and gain life equal to the number of
nontoken Demon or dragon creatures you
control