Honorable Mention: Second Harvest When youre ready to swing for lethal and win the game, Second Harvest is a one-shot surprise Rhys, the Redeemed
Having a well-rounded suite of removal cards is essential for achieving victory in Magic: The Gathering Commander
I am sure it wants at least one big mass clear effect
These are the big, dramatic cards: Planeswalkers, Legendary Creatures, massive mana-intensive spells, and chase cards that are playable across multiple formats
Cards that only cost Phyrexian mana like Gitaxian Probe or with alternate costs like Thunderclap and Foil dont just make it easier to trigger Eris
The Ur-Dragon is potentially the most powerful Dragon commander with its 'eminence' ability making the rest of your Dragons one generic mana less to cast, even if The Ur-Dragon isn't on the battlefield