Hero's Downfall is not that great in Modern. In fact, I would say it is pretty bad for modern. Path to Exile and Dismember r much better removal spells in the Modern format. Paying 3 mana for removal in Modern is a no no.

Good luck!

Thanks for the advice! I will put in Path to Exile but Dismember doesn't really work. Thanks.

Viscera Seer allows you to go infinite with Anafenza and Finks.

I see what you are saying, but I why would i need to scry infinity?

Oh wait nevermind. I see what you are saying infinite life gain.

Oblivion Ring is slow and inefficient in modern in terms of removal as it's slow at 3cmc and dies to removal in the form of cards such as Abrupt Decay, Golgari Charm, Qasali Pridemage, Destructive Revelry, etc. I would recommend replacing your copies of it for 2 more Path to Exile, and 2x Abrupt Decay, 2x Inquisition of Kozilek, or 2x efficient creature that can be hit off of collected company.

Oracle of Mul Daya is slow if you want mana acceleration then add another 1cmc ramp creature, if you want land filtering run Courser of Kruphix, or if you want something for the late game run another Siege Rhino, Wilt-Leaf Liege, or a Thrun, the Last Troll. As is the card is to slow to function as ramp as its at the top of your curve and its low toughness results in it dying to all the most common removal in the format, its cmc is also to high to be hit off of company.

Liliana, Heretical Healer  ^Flip, is another inefficient creature for modern if you want strong liliana effects Liliana of the Veil is strictly better and goes straight to work as soon as you cast her while if you want a strong 3cmc creature you would get more value out of something like Kitchen Finks, or Loxodon Smiter.

If you want to get the most value out of kytheon and collected company I would advise you lower your decks curve with more low cmc value creatures such as more Voice of Resurgence, Kitchen Finks, Loxodon Smiter, Scavenging Ooze, Gaddock Teeg, Qasali Pridemage, etc.

In terms of junk vs burn the best thing junk can do is bring a full play set of rhino, voice of resurgence, as well as some kitchen finks and scoozes, as well as depending on the list possibly sideboarding in Feed the Clan.

thanks for all the advice! I made a bunch of changes of what you said.

Currently, the cheapest fetchland in your colors is Windswept Heath. Fetchlands are also very effective when used in conjunction with shocklands, like Temple Garden or Overgrown Tomb. Woodland Cemetery is generally considered inferior to either shocklands or fetchlands.