Street Fireblast

Spellbook {2}{r}{r} - You may pay {1} to play
this card face-down as a 0/2 colorless artifact
book token. You may then cast this spell by
paying its Spellbook cost. You must still follow
the card's other casting restrictions.
Target attacking creature takes 5 damage. If it
would be killed, exile it instead. If this spell was
cast using its spellbook, this deals 3 damage to
the creature's owner as well.