SpaceX Rocket

Whenever a creature you control dies, you may
instead exile it with a Mars counter.
At the beginning of your turn, if no creatures are
in play and no player casted a creature during
their last turn, you may sacrifice SpaceX Rocket:
roll a six-sided dice for each creature exiled with
a Mars counter, if you roll a 6, return that
creature to the battlefield under your control,
otherwise, put that creature into your graveyard.