Flash, Deathtouch

As long as XXX, Lost Beyond The Spark is in your command zone, at the beginning of each end step put a finality counter on target permenant

When this creature enters, each player sacrifices all permenants with a finality counter. You may cast spells exiled this way by paying life equal to its mana value rather than pay its mana cost. Whenever you cast a spell this way, you may return target permenant to it's controllers hand