Reality Stone

During each opponents upkeep, that opponent
exiles their hand. During each opponents
draw step, that opponent instead draws
cards equal to number of cards exiled
during the upkeep. Put all cards exiled this
way on the top of the library, then shuffle the
library.
You and permanents you control have hexproof
as long as it's your turn.
{t}, Add {u}{u} to your mana pool.