Two of the easiest upgrade paths would be to head toward a big artifact / reanimator strategy with cards like Goblin Welder, Daretti, Scrap Savant, and other huge artifact finishers like Wurmcoil Engine, or play a token- / Thopter-themed deck with the help of cards like Sai, Master Thopterist, Pia and Kiran Nalaar, and friends
it sucks that you lose the planeswalker if you have to deal with a must-kill threat
This made the Izzet Prowess incredibly strong and consistent, with over 40% of the decks in the latest Pro Tour featuring it, and it also forced players to either outpace this deck or have answers for Cori-Steel Cutter before it ended up dominating the game
Sigils of Ruin Cards
Phyrexian Swarmlord
2 Light-Paws, Emperor's Voice A new option for a Mono-White aura deck, Light-Paws, Emperor's Voice is a stellar commander option and perhaps one of the strongest Mono-White commanders in the game