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There are a few known players that have actually ripped an Eriks Curiosa (myself included)

In fact, though you can typically find 1 Ultra Rare (which is one rarity level below Secret Rare) in every 5 packs as a general rule, though this can vary slightly between sets the frequency of Secret Rares is much lower

Later Field Spells typically also provide effects such as recycling cards, weakening the opponent's monsters, searching monsters and/or swarming the field

Learn (2021) Learn absolutely defined Strixhaven, both its Limited environment and one of the last cards to be banned in Standard (Divide by Zero)

Or at least a heavily warped version of it