The Broken Throne

When The Broken Throne enters the battlefield,
you become the Monarch.
While you are the Monarch, whenever an
opponent attacks you with one or more creatures, reveal the top 3 cards of your library.
Your opponent chooses two of them, then you
choose one of those two. If it is a permanent card,
you may put it onto the battlefield. If it is an
instant or sorcery, you may cast it without paying
its mana cost.
The Broken Throne can be your commander.