gardevoir full art pokemon card & Sylveon GX (Full Art) (205/214) [Sun & Moon: Unbroken Bond – Plug Listed cards may have imperfections. Gardevoir TCG Complete! : r/pokemon

This would create a ton of problems in a tournament environment, as decks would become illegal if they lost cards

However, if a Lion Umbra you control is attached to a creature you don't control and that creature has no Auras controlled by that creature's controller attached to it, no Equipment attached to it, and no counters on it, Lion Umbra will be put into its owner's graveyard due to being attached to an illegal object the next time state-based actions are performed

If you put this on someones commander, all they have to do to get their commander back is sacrifice it

Rare Rare cards are harder to find, with a blue banner