Mind Flayer, Bane of Life

Deathtouch, Lifelink, Haste, Trample, Flash
When Mind Flayer, Bane Of Life enters the battlefield, if an opponent controls a human creature, you gain control of that creature,
draw a card, create a 3/3 Demodog with
" Whenever this creature enters the battlefield,
if you control a Legendary Creature, each
opponent loses 3 life.", and each
opponent loses life equal to the number of noncreature spells in your graveyard.