Picky, Picky, Picky

As an additional cost to cast, you may sacrifice an artifact.
Picky, Picky, Picky deals 4 damage to target creature you don't control.
If you sacrificed an artifact to cast this spell, Picky, Picky, Picky deals 2 damage to target opponent.
Overload {2}{r}{r}, Sacrifice 3 artifacts (You may cast this spell for its overload cost. If you do, change "target" in its text to "each")