Saphi, Mycosian Brooder

Time Lock -- Each turn, an enemy in staging is time locked, preventing any change to that unit's casting time.
Silt -- Whenever an allied Mycosian unit enters play, it gains the Stealth buff & the hero draws an additional card.
Saphi is a Thallian, one of the ancient Mycosian sages. Wherever she goes, multitudes seem to follow.