In Magic: The Gathering's Commander format, every card since the first set is legal to play (so long as it is not banned or illegal in all formats)
You could always Rite of Replication on Nyxbloom Ancient to see how much mana you can make in a single game
The rarest and most valuable cards from the Base Set are among the most coveted cards of all time
If are getting a lot of those decks against you, I would recommend trying to get a copy of Rampaging Ferocidon (I know, I know, its rare...)
These cards will appear in both art card and foil-stamped signature art card versions
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