Vaax, Master of Encryption
Whenever you cast an instant or sorcery spell that does not contain
the word "extra"
in its text, you may pay {u}{b}. If you do, that spell gains
cipher. (After that spell resolves, 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 encoded card
without paying its mana cost.)
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