Maavik, Bane Alley Cutthroat

Eminence - At the beginning of combat on your turn, if Maavik is in the command zone or on the battlefield, target Rogue you control gains shroud and skulk until end of turn.
Whenever Maavik deals combat damage to a player, you may pay {u/b}{u/b}. If you do, the next instant or sorcery spell you cast from your hand this turn gains cipher.