Wow masked hero is in the meta for almost 7 months. Nicely done Konami, glad I bought the deck back in the day and Zero regrets so far. I won't really bother if you limit it soon or whatsoever, I already have my Buster Blader deck (purchased it with gems!). But this deck will remain forever as one of my very favorites.
Imo, is not really good to invest your next 10k gems in the same deck. Let's say you built a complete MH deck in March, then It's way better to spend your 10k gems in a new deck around May-June. Spending in the same deck will make it for solid T2 deck, (I'd only do such thing if I really like the archetype, but that's just me).
This being said I think Buster Blader is the future lol
But where was he?? I looked and looked in all of Jaden's duels in the GX manga and I never saw him use anything called Anki or Shadow Demon, and I never saw him use the effect. It wasn't listed in the index either. The closest thing I saw was a 2800 atk called daian that had a different effect.