lurrus
Decks with Lurrus of the Dream-Den as a companion are still able to have cards in their starting deck with CMC 3 or more when playing in Historic. I've played against this at least twice now and just did it myself to test it.
2
votes
DRock#45270
shared this idea
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DAC169#34537 commented
Lurrus only cares about the CMC of permanents in your deck to be your companion. Instants & Sorceries could have any cost and Lurrus would still be able to be the companion.