In the early days of Magic it the deck used Llanowar Elves, Gaea's Touch, Birds of Paradise and Wild Growth for mana ramp and the threats consisted of classics like Force of Nature, Craw Wurm, Erhnam Djinn, Killer Bees, Ifh-Biff Efreet, and Triskelion
Similarly, Omen Hawker and The Enigma Jewel can function as a ramp for Gogos copying shenanigans
Think about it: rogues hit someone fast and hard, sift through their data (represented by milling), and steal their intel (represented by drawing cards if they mill creatures)
Prosper, Tome-Bound decks can play fairly or enable busted combo turns thanks to the mana production coupled with all that delightful card draw
Not bad, and you are happy to do it, but youd prefer something bigger and better