Isjatni, Shadow Servant

Menace, Myriad, Ward Mill four cards
The "legend rule" doesn't apply to Istjani,
Shadow Servant
At the beginning of your postcombat mainphase,
if you dealt combat damage to all opponents this
turn, you may cast target spell from a graveyards
until end of turn, and you may spend mana, as
though it was mana of any color to cast it.