Poison, Ruthless Manager

{x}, {t}: The next creature spell you cast this turn
costs X less colored mana to cast. When that
creature enters the battlefield, Poison, Ruthless
Manager deals X damage to it.
{2}{r}, {t}: Poison, Ruthless Manager deals 2
damage to target creature. At the beginning of
the next end step, put a +1/+1 counter on that
creature.
"You're too delicate, sweetheart."