Mongul, Tyrant of Warworld

When Mongul, Tyrant of Warworld enters the battlefield you become the monarch.

At the start of your combat phase if you are the
monarch Mongul, Tyrant of Warworld may fight
target creature.

"At last. The old man who conquered Mongul-Who-
Was. Now you face the Mongul-Who-Is. And your
bones will adorn my banner-spear for a thousand
thousand years."