Havoc Amplifier

Whenever you cast an instant or sorcery, put
a charge counter on Havoc Amplifier.
At the beginning of your end step, deal
damage equal to the number of charge counters on Havoc Amplifier to any target,
then remove all charge counters.
{u}{u}{r}{r}, Sacrifice Havoc Amplifier: Draw
a card for each charge counter on it.