The card can be very strong, but like said very mana intensive. When playing Controll i will play it over memory jar for sure. Mirari is nice but that thing is even more mana intensive and you can't really builton it for drawing cards. Yes it will double some spells, but that will only help ifyou can play them in the first place.
I've been considering playing the card in Landstill, the deck might run this card. It's mana-intensive (enough lands

), the CC is not a real problem, Disk costs 4 too so the 5th mana should be do-able. Most Drain-based decks could run this card. However most got better draw-engine's like Ak, TfK or Skeletal Scryings.
The cards will win you games whenit hits play, but when you drawit early itwill often be very dead. 5 mana is no joke and using it take's 1-2 mana (or more) every turn. If you got that much mana AND time (like Landstill) this might be a good try, otherwise I'd stick with Scryings&Co.
Tijnie