If you are looking for instants to take down hasters, I might recommend Mortify, Orzhov Charm, Anguished Unmaking, and Hero's Downfall.

There's also the tried and true ones like, Fatal Push, Portable Hole, and Murderous Rider.

These are all prime picks. I did take most of them into consideration, my card knowledge has improved a lot since my early days as deckbuilder. Orzhov Charm was completely off my radar as well, and is going right into my list. I've updated the deck and will be testing with Soul Partition first. If that doesn't fix this decks' weakness, I'll implement Charm and then Oath.

Sheoldred, the Apocalypse might be a little slow but synergizes pretty well. (I did not notice this card is $60, nevermind then)

Dark Deal could be funny.

Maybe Master of the Feast?

Dark Deal is worth testing, I believe. Thank you!

Need to test how often Rule of Law keeps the opponents hand full. Master of the Feast was already suggested. Flumph fills his spot better, in my opinion.

I uncluded Sheoldred, the Apocalypse as soon as it was previewed while brewing this deck, because it just "has" to fit, you'd think. I'll not go into detail why it didn't, it was very suprising to me, but perhaps it does now. It goes into Underworld Dreams's spot, if so.

Tried it out in arena because it seemed funny, but this is actually pretty strong. I like it