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It's also a nice surprise out of nowhere with Cabal Coffers if you don't control Urborg, and it's Isochron Scepter-able

Even with those debuffs, all three of these equipment see a ton of play in various formats

If this card is Ritual Summoned: You can add 1 "Megalith" Spell/Trap from your Deck to your hand

Its GX attack, Dark Mist GX , is cheap and mildly disruptive, placing one of the foes Benched Pokmon and all cards attached to it back into their hand, but there are far better GX attacks out there and this one is probably best used in an emergency where its absolutely critical rather than depending on it every game

Last year, one of those cards for $90,000 at auction.

If its the third time, Omnath deals 4 damage to each opponent and each planeswalker you dont control. Its all just very silly, and its value every single time you do anything