Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Death's Shadow

This creature gets -X/-X, where X is your life total.

Skyclave Apparition

When this creature enters, exile up to one target nonland, nontoken permanent you don't control with mana value 4 or less.
When this creature leaves the battlefield, the exiled card's owner creates an X/X blue Illusion creature token, where X is the mana value of the exiled card.

Lightning Helix

Lightning Helix deals 3 damage to any target and you gain 3 life.