Big creatures!!!

[Madsam]

I think Admonition Angel would be a great creature to be put in with Hypergenesis.
Automatically removes opponents creatures (and other evil stuff) that were put into play by your opponent, and since you have enough lands in the deck, you can keep on removing.

Another question:
Do you really want to build the deck with Hypergenesis?
I would build it as a U/R/w control, that finishes with big creatures.
Supported with Academy Rector and cards like Idyllic Tutor it could work.
Show and Tell would also be great in that. Maybe some Emrakul of the I win lolz?

Sneak Attack has also a great synergy with persist creatures (Twilight Shepherd maybe?)