When all of your cards just fuel an inevitable stream of Bloodghasts and Prized Amalgams, there arent as many interesting decisions on either players side as there are from extremely varied game pieces, such as a 6/6 flier that is worth killing but can eventually come back at a cost of some mana, unlike so many of the other graveyard recursion creatures
Along these lines of powerful creatures you don't want countered are ones you paid additional costs for like Vile Mutilator, spent all your mana on like Wan Shi Tong, Librarian, or somehow gave up resources like with Realm-Scorcher Hellkite
One of the most popular directions to take a deck is the kindred route
Set: Magic: The Gathering Avatar: The Last Airbender
Let's start with the "what is"
Im not sure WotC wants to bring back threshold anytime soon, but I actually dont think you would need to