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Cards that "represent negative play patterns and interactions that you generally shouldn't spring on unsuspecting opponents", and which would probably be banned if uncards were made legal

If an activated ability of a card in exile with a brain counter on it references the card it's printed on by name, treat Rex's version of that ability as though it referenced Rex, Cyber-Hound instead

It does, however, ask that you have a creature on the battlefield, where spells like Animate Dead, Reanimate, Exhume, and Unburial Rites do not

Descent: Journeys in the Dark (Second Edition) Lair of the Wyrm

You can only use each effect of "Ancient Fairy Dragon" once per turn

But given how long games go with this deck, that wont save them forever, and you can realistically really constrict someones mana if they stumble