What makes you think that Metaphys is related to this card? This is just a generic card used in a Metaphys deck but doesn't belongs to it. Make that clear there is no card in Metaphys deck that has a limitation. You can still run 2 even if they limit this broken animal.
This card is the problem. Limit 2 and there is no limit with any Metaphys card. So you can still run 2 of this. Don't mention Gold Sacro, again that is a generic splashable broken card and it doesn't belongs to Metaphys since the beginning.
"There's no limit in metaphys card" why should there be? The deck is a joke
"Splashable" but only works fine in 2 decks, no other deck uses it because is slow af
"Broken" again broken in only 1 deck, the deck you don't want limits on
"Doesn't belong to metaphys" so I guess all monsters in your extra deck and all spell/traps in your deck share the same word in their names right?
That's how it should be roar,dark and duo all those 3 should have the share the same limit 2 so 3 of them can't coexist in the deck and so they can't abuse charge/sarc
As long as Aloof is here they can just do direct banishment from the deck and activate broken TD effect. Best thing is to limit Roar & Aloof both limit 2. If Aloof continue to be unlimited then the problem will continue to exist. The deck must lose Aloof.
About time thunder dragon gets the darklord/shiranui treatment, all the core should be at 2: levianeer, roar, dark and hawk. Duo should be at 3 if at some point they want to run veil/destiny draw stall bs
TD is a 🔥ing broken deck because the way people can banish cards directly from the deck and activate those effects easily. Banishment effects are strong & that's why they should not allow direct banishment from the deck. Lucky for you, Komoney has been too kind for many broken decks in this game, including this one that always escape the banlist.
If you look closely, there are at least 2 KoG decks (August 2021) that use Necrovalley, and they are not Gravekeepers.
http://duellinks.gamea.co/c/rc5lstx6
That was just an example. XYZ Water decks etc also use it.