>>18542054I don't think anyone would even notice if you ran foreign basic energy. I know I wouldn't.
I've got a few japanese cards that I bought for collection purposes, mostly some of my favorite Pokémon like Great Rocket's Mewtwo from the TCG sequel on Gameboy or the holo promo Scyther the japs got with their Unleashed/Undaunted equivalent. Other than that, just a few french Unseen Forces cards that I got when I visited France in 2006.