Half of the time, its simply a slightly more expensive Eerie Interlude, while the other half its a slightly more expensive Eerie Interlude with some extra sauce on top
Not only did it sound difficult, it sounded silly
As a super super rough guide I would want upto 50% ramp effects, 25% mid level threats and value and up to 25% heavy threats contingent on the amount of ramp you have
FromTheShire: Not terribly exciting in a vacuum although it's not bad certainly, in a Daretti, Scrap Savant style artifact recursion deck the repeated scry adds up quickly
However, it became more valuable to collectors with time
One thing to note about Prophetic Prism in UW Blink: It not only facilitates much needed card advantage but can also fix our mana, and you may have noticed