Magzar, the Agitator

Ambition—{1}{b}{r}, Pay 1 life, Discard a card
Contribute {b/r}
Creatures spells Magzar, the Agitator contributes
to enter the battlefield ambitious.
Magzar, the Agitator gets +1/+1 for each other ambitious creature you control.
At the beginning of your end step, draw a
card and lose 1 life for each ambitious creature
you control.