Moloch, of Limbo

Moloch enters the battlefield with target immunity until end of turn
each card drawn will damage target player, the damage will be indicated by
the total mana cost of the drawn card
put a +1/+1 counter each time opponent uses spells on your turn
{p/b}, {t}sacrifice any spell in play, draw two cards
"i haven't heard no man escape the grasps of... whatever they call him"