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This gimmick, which dates back to the early Gym Heroes and Gym Leaders sets, features Pokmon cards that "belong" to a specific trainer from the game

Furthermore, a player's deck and sideboard cannot feature more than four copies of any single card

They will very likely be able to make some tests and verify a card for you

It's also a partner commander, and the possibilities are quite interesting build a black and red deck around blood in the art, or a red/blue deck based around water/aquatic creatures

If they know its in your deck, its not that useful but you can be pretty safe in assuming if you go to Worlds that no one will know that its in your deck as long as youre quiet about it