That being said, you're fairly Commander-reliant, as one might expect of a Voltron strategy, so even though Firion often will have Haste when he hits the board a second time, as soon as you're casting him for 7+ mana, you're having a rough time of itCommand Beacon or even Campfire could be considerations to get Firion back in the game, with special mention of Campfire also shuffling lost Creatures back into the Library for further polymorphs
Swift Demise I count Swift Demise because it would work with many alpha strikes (yours or your opponent's), but more importantly pairs up beautifully with cards that spread one damage to all your opponent's creatures like Iroh's Demonstration and End the Festivities
The most common of these is Akromas Memorial, a Commander staple that will give most creature-based decks a leg up in combat
Planechase is back too, so each deck has a number of brand new plane cards
Emerald Sapphire is all about Inventors, and when characters with that keyword enter the mix youll want to compliment them with Support characters, Locations, and Items that allow you take full advantage