Depending on how the meta evolves after rotation, Team Rocket cards could become even more valuable
Power, Cubed Click to see all cards (I'd take Ancestral Recall, personally, but a brief poll of the Pit indicates opinions are fairly evenly split among Black Lotus, Ancestral Recall, and Library of Alexandria.) The most broken cards in history are coming to Magic Online with the new Magic Online Cube: Holiday 2012
Veloci-Ramp-Tor Dinosaurs are perhaps the toughest creature type of the lot to support in Cube for their generally high mana values, but some cards here help move the needle
Thankfully, Zendikar Rising is a pretty good set thats filled with some exciting new mechanics - and the return of some other favourites, too
Then if you control three or more creatures with different powers, you may play the exiled card without paying its mana cost.
The owner of Sellbot1 may also be running Sellbot2, which sells different kinds of cards, and stored credits will also work on it