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This is an Ultra Rare item.

It features four new Tera ex cards of Ogerpon, including Teal Mask Ogerpon ex, Hearthflame Mask Ogerpon ex, Wellspring Mask Ogerpon ex, and Cornerstone Mask Ogerpon ex, alongside a regular Pokmon card for Teal Mask Ogerpon and an item card called Ogres Mask

Such fillers are apparently sometimes used in other TCGs (see The Collation Project on the topic of Magic: The Gathering) and are discarded after cutting (though I wouldnt be surprised if there are Jungle packs accidentally containing a blank card out ther...

The Classic set marks Pokemon's most expensive trading card product of all time, and resellers are pushing the price even higher.