balloon pokemon gold card M Charizard EX The Retreat Cost of the Pokémon this card is attached to is Colorless Balloon · Unfinity Tokens (TUNF)

They're basically uncounterable and they can't be interacted with in most situations

In order to activate the ability must I have some other means of looking through my library

Maybe WotC was nervous about potential leaks, since they'd have to present those Final Fantasy cards to different parties ahead of time, but whatever the reason, the whole Commander set has been revealed weeks before the main set's full spoiler

Tekuthal, Inquiry Dominus is pretty restrictive as doublers go since only a narrow range of decks care enough about proliferation to support it, but the horror does a great job where it matters and becomes awfully hard to remove thanks to the activated ability