Klexyia, The Watcher

Flying, Vigilance
{w}: You may untap and remove all creatures you control and creatures blocking creatures you control from combat, do this only on your turn
{w}{w}{w}{w}: If you remove all creatures from combat, you may instead start an additional combat phase with Klexyia, The Watcher attacking, alone, gaining +1/+0 for each creature removed from combat this turn