Hypothesizzle is pretty bad, it costs too much. Either it's a worse Chemister's Insight, or it's only slightly better than fucking Ember Shot. It's great in limited, but in limited you play 5 mana instant speed removal any time you can.
Speaking of Chemister's, it's generally just better for a deck running any number of counterspells to use instant speed draw, not sorcery speed draw. Compare a turn 3 divination with the shields down to a turn 4 chemister's with the shields up, and then realize you can turn dead cards into real cards too. Same thing with the Locket, you don't want to slam it on turn 3, because you want removal, counters, or board presence on turn 3.
I'm not really a fan of Ral, but if you can stick him safely you probably win. Niv is generally a safer wincon though.
Overall, your going to want to decide if you want to play a control or tempo deck. In the meantime, just drop some of the inefficient cards and throw in 2 more crackling drakes, in control they are important because they are must answer threats that cantrip, which is soft protection for Niv later on top of the threat itself, as well as being your anti-carnage tyrant card since you won't have white sweepers. In tempo, it's your top end threat that curves out.