Cataclysmic Convergence

at the beginning of your upkeep flip a coin if
heads sacrifice one of your permanents to the
exile if tails your opponent dose instead
all cards no longer go into the graveyard they go
into exile instead
once per turn you may switch one card from your
exile with one on the field with a cost equal to or
less then the card on the field
i have become death destroyer of worlds...