Zato-1, Assassin Mastermind

Break the Law- When this creature enters the battlefield and on your end step, phase out each
other creature you control. Creatures you control
that are phased out phase in at the beginning
of your combat step rather than your upkeep.
Dark Sentinel- This creature's toughnes is equal
to the number of phased out creatures you
control. During combat on your turn, this
creature's toughness is 1.