Have you thought about adding Thalia, Heretic Cathar? Goes along with the "creatures and lands enter the battlefield tapped" sub-theme you have going.

WhiskySundae Definitely going in. Thanks!

If you want to explore the political side of Marchesa more, you might consider adding some voting cards. Most are not very good, but there are some playable ones.

The best is probably Council's Judgment. Coercive Portal can be played in a situation where one player other than you is obviously far ahead of the others. Magister of Worth works the same way. Bite of the Black Rose is interesting, but I like it simply because it doesn't affect you at all.

UpsetYoMama These are some really interesting suggestions. I'll definitely consider them. Thanks!

Sphere of Safety and Glacial Chasm are really good additions to the deck. Also, Darien, King of Kjeldor is a decent card which can pump out tokens. Savage Beating is a game-winning card for me in my Kazuul pillowfort deck. If you want you can take a look at it, it is in my decklist folder.