Mass Unmaking

Return each nonland permanent with the most
common color among all permanents or a color
tied for most common to their owner's hand. For
each of those permanents you own and control,
you may exile that permanent then return it to
the battlefield tapped under your control instead.
Flashback {7}{w}{w}{u} (You may cast this card from
your graveyard for its flashback cost. Then exile it.)