Mono blue frequently empowers combo decks, such as Urza, Lord High Artificer whose commander deck power level can creep into CEDH
Niv-Mizzet Reborn By far the best payoff commander in 5-color strategies, Niv-Mizzet Reborn is often the main reason to build the deck in the first place
Invasion of Alara In terms of raw power, Invasion of Alara is absolutely the strongest Battle card out there
These tokens are decayed, so you'll need to sacrifice them after combat, but you can use this to bank Zombies for later turns, especially if you're planning on sacrificing a lot of them
Bringing with her a number of Insect tokens equal to the number of creature cards in your graveyard, Izoni can easily deliver you an instant army in a dedicated self-mill strategy
This is a real issue when most Vintage Cubes have a Black Lotus, all the Moxen, Time Walk, and more