Stellaris Scriptorium

When Stellaris Scriptorium enters the battlefield, it doesn't untap during its controller's next untap step.
{t}: Add {w} or {u} to your mana pool.
The pureblood bishops and cardinals of House Stellaris, alongside many layers of Priesthood underlings, dictate the tenets of religious subservience and Imperial law - though the two are virtually indistinguishable within the Eternal Empire.