Riddle me this (EDH / Commander)

My wife likes Sphinxes. She'd have liked an Unesh, Criosphinx Sovereign deck, but mono-blue isn't her thing, so here's a try on Yennettn Cryptic Sovereign instead.
Esper seems like a good call for a cycling deck, and Sphinxes have a lot of nice ETB effects.

There's a few ways this deck can win :
1) Cheating big spells with Yenett or some other effects to get a quick advantage, In Garruk's Wake and Angel of Serenity for example can help controlling the board for example
2) Sphinx Mindbreaker with some Slide effects can deal with all opponents by milling them, and will be hard to remove
3) Magister Sphinx with the big flyers of this deck can be scary aswell and can even help you avoid death in some instances
4) If nothing's working, there's still Approach of the Second Sun, which can win the game very quickly with all the draws and scrying this deck can do. It's also cheatable thanks to Yennett, Cryptic Sovereign

Aside from that, some cards can have a big effect on the board :

• Herald of the Forgotten can cheat a ton of things into play, laying ground for your game-winning pieces
• Angel of Despair and the sliding enchantments + Cloud of Faeries might clear most of the annoying permanents on the table
• Drake Haven and Bone Miser can't be underestimated either, and might win you the game in the long run
• Dire Undercurrents provides a lot of card advantage with some Astral enchantments

This deck might be a slow starter, but it should work well anyway. ^^