ruinous path for hero's Downfall.

Wannahokaloogy, good suggestion, will definitely keep an eye out for Hero's Downfall

Demonic Tutor, Vampiric Tutor, Enlightened Tutor, Diabolic Tutor, Diabolic Revelation, Idyllic Tutor, Academy Rector, Serra's Sanctum, Toxic Deluge

A lot of things that could make this build a lot better. How does Liliana, the Last Hope do in this deck? Doesn't seem synergistic with anything but Ayli, Eternal Pilgrim, which probably would be a different strategy in a different type of deck

Liliana, the Last Hope has been removed, was in there because I had her, and was waiting to trade her after the pro tour.

Ayli, Eternal Pilgrim is surprisingly useful in the deck, as it creates a large amount of tokens an has the ability to recur creatures pretty easily, which means her exile ability is very useful. additionally, she can kill karlov either in response to removal, or in tandem with Sanguine Bond or Vizkopa Guildmage.

this list is very outdated, an I will be updating it tonight, more tutors are definitely wanted.

This deck is amazing! Thank you for linking it in my Karlov deck! I have a list of deck changes that I'm already going to make to mine, but your's certainly helps. If you like combos, another fun one is Cliffhaven Vampire and Exquisite Blood. I just recently won a game that way.

SqueekyCheeky, I cut cliffhaven pretty early in my decks lifetime, I find viskopa guildmage fills the same role and is always tutored for instead of any other piece. Basically my tutors are filling the role of redundancy especially Demonic Collusion which can find the entire combo by itself.