The other text on their cards isnt particularly relevant, though Deranged Assistants mill and Sea Scryers color fixing can be helpful on rare occasions, so dont discount it entirely
You may target a creature that is already tapped with Sharae's first ability
Uril, the Miststalker Uril, the Miststalker is almost like the creature version of Ancestral Mask
Focus on the best sliver for each buff you want, cut the rest, and replace them with tutors like Vampiric Tutor, Demonic Tutor, Bring to Light, and Wargate
The latter cards are the equivalent of the Special Illustration Rare cards, which are among the most expensive cards in the physical game