Dimir Spellwarper

Dimir Spellwarper is unblockable.
{u/b}{u/b}, discard a card: The next instant or sorcery
spell you cast this turn has Cipher (After you cast
that spell, you may exile it encoded on a creature you control. Whenever that creature deals combat damage
to a player, its controller may cast a copy of the spell without paying its mana cost.)
Transmute {1}{u}{b}