overwhelming splendor timestamp issues with equipment and not stopping equip
My opponent had a creature equipped with Embercleave and Maul of the Skyclaves. I played Overwhelming Splendor on my opponent and all their creatures should lose all their abilities. Both the equipment giving the abilities and them losing those abilities happen in layer 6 and would then activate in timestamp order. This would follow that the creature gains trample, double strike, flying, and first strike and then it loses all abilities. Instead, the card lost it's inherent abilities, but retained the ones from the equipment. This would only happen if the creature was equipped again (or gained abilities somehow through an aura or other means after Overwhelming Splendor resolves) so that timestamps in layer 6 would be lose all abilities and then the equipment gives the creature those keywords. Granted, in either case the creature will still have it's p/t increased in layer 7 by those equipment.
Edit: This was actually Embercleave's enter the battlefield attach ability, nevermind.
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Second Issue. The opponent could still equip despite Overwhelming Splendor stopping all activated abilities besides mana or loyalty abilities, which means equip is not marked in the engine as an activated ability. I would not be surprised if crew for vehicles also was not marked, so things need checked.
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I am a judge, I double checked in the judge chat irc when I saw this, it works this way. The equip rule for it being an activated ability is 502.33a. Here are the layers rules explanations: https://magic.wizards.com/en/articles/archive/layer-system-2009-11-05
There seem to be a number of issues with Overwhelming Splendor and layers. Timestamps for it really only need tracked for layer 6. Anything in layers 1-5 will always happen from creatures and anything after will never happen on creatures.
This affects a competitive deck in Nine Lives, I feel for the unity programmers having to deal with Overwhelming Splendor as it's a well known complex effect from the old card "Humility", but this does need fixed soon.