His Infinite Masquerade

Search your library for a legendary spell, reveal
it, then put it into your hand.
Cipher (Then you may exile this spell card 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.)
"Lazav. If we want any chance of winning this war,
we must find Lazav."