I've seen other variants of that Mewtwo ex in a lot of matches since then (it's a card that's pretty prevalent in the meta) but out of the dozens of battles I've played, I've yet to see more than one or two people rocking the gold model
When it enters, it tutors any equipment straight into your hand, and once equipped, cards like Sword of Fire and Ice or Umezawa's Jitte get even nastier
Ancient Stone (Minds in Harmony) is also very good against it, as long as you draw it with some actions to spare
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You can't use him to challenge something, get some damage on him, and then ready him and quest since all of Ruby's readying abilities say you can't quest after readying
Burst 3) from the top of your deck to your drop area to activate