Climatic Duel

Cast only if you control a legendary creature.
Cast only if there are two players left.
Target legendary creature you control loses all counters, then choose a target legendary creature
your opponent controls. It loses all counters and
then fights your creature. I only one creature
dies, than its controller loses the game. If both
die, or neither die, that this spell as no effect, and return all counters to both target creatures.
Their battle was not for their own, but for the sake of
the