Emperor Palpatine

Instants and Sorceries in your graveyard have Darkside, where there Darkside cost is equal to
their mana cost. (You may play a card with
Darkside from your hand or graveyard for it's
Darkside cost if you lost 5 health or dealt 5 damage
this turn. If you cast it from your graveyard
this way, Exile it.)
Whenever you pay a card's Darkside cost,
Emperor Palpatine deals 2 damage to any target.