This means that they cant be chosen for any card effects, and your opponent can only Challenge them
Are you against the idea, have I convinced you to try, or do you already use them yourself
If an effect cares about the rules text, flavor text, or watermarks of a creature who's had its text box stolen, the effect sees nothing but an empty pit of sadness
Universes Beyond: The Lord of the Rings may just have been the peak of Magic the Gathering's Universes Beyond concept, and the cards that come from the booster packs have prices that attest to this
I think its tempting to over sideboard here, but there are cases where more cards is correct
*Distribution quantities are limited