The Reality Chip

You may look at the top of your library at any time. As long as Rauru, Right Hand of The Zonai is attached to a creature, you may play lands and cast spells from the top of your library. Reconfigure {2}{U}({2}{U}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn’t a creature)