Originally Posted by
Claymore
My thought with 8ball Rector is that you can build a deck that wants to get a Rector (either one) onto the field very quickly and capitalize on doing broken things with it, as soon as possible. It's not really in the realm of Interactive Fair Deck Nic Fit anymore. It's more "do broken dumb shit in Legacy" now, which I think can be way more powerful/hard to interact with than a traditional Nic Fit deck.
That's why I think you could look at including stuff like Eureka, which can drop your Rectors or the bombs into play. I think that people here are right in that you want to go blue for Brainstorm and the likes though, but I think going Explorer+Therapy is the right shell to get your 4 drop online fast as well as ramp into sweepers.
Eureka -> Rector + Phyrexian Tower -> Any walker/enchantment that can answer anything the opposing deck laid out, short of a Blood Moon + Rector exile trigger. Splendor, Dovescape, Elspeth, Ugin, Little Gideon...
I don't think Gamekeeper is viable since it is so variable, needing to mill down to a creature.