Timey Whimey Space Stuff

Additional cast cost; pay {w}{w}{u}{u}{u}{b}{r}{g}
At the beginning of each players end step,
if its not an extra turn, they get an extra turn.
{6}{t}; Reverse the turn order
{7}; End the turn.
{u}{u}{u}{u}{u}{t}; take an extra turn after this
one