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For example, every time your opponent declares an attack on your monster, you gain a spell counter, increasing your attack and reducing battle damage

The best comparison I can make to this is something like Augur of Bolas, Fallaji Archaeologist, or Sea Gate Oracle

Chart shows the price of Meowth [Build-A-Bear] #67 at the end of each month going back as long as we have tracked the item.

Unfortunately, the 3-star immersive cards are the rarest pull outside the Crown Rare cards, so this may take some time to complete, but given how many packs it may take to meet Mew's requirements, odds are you may have the others by the time you unlock that one