once upon a nightmare

when this enters the battlefield put a pain counter on this card for every 2 damage you've taken this turn.
then if there is 1 pain counter on this card make a 2/2 red black imp token.
or if theirs 2 pain counters on this card make 4/4 red black demon token.
or if theirs 3 pain counters on this card make a 5/5 red black demon token.
{3}{t}:draw a card and remove a pain counter from