Time Rift

At the beginning of your end step, if you control
10 or more phased out permanents, you may take
an extra turn after this one.
{0}: Target non-land permanent you control
phases out. You lose life equal to half it's mana
cost rounded down. Activate only when you
could cast a sorcery spell.
{4}{u}{u}: All non-land permanents you control
phase out. Activate only once.