The Tesseract

{t}: Add a charge counter to The Tesseract
{t}: Remove X charge counters from The
Tesseract, add X colorless mana to your mana
pool
If The Tesseract leaves its owners control, then
each opponent reveals cards from their library
until a creature is revealed, they may play that creature without paying its mana cost. Shuffle
the other revealed cards back into library.