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Tons of artifact combos revolve around cards in your graveyard, with sac outlets like Krark-Clan Ironworks and Grinding Station facilitating loops with cheap artifacts like Myr Retriever and Lotus Petal
Its also a rather brilliant (though divisive) marketing technique, as people who might not normally have paid $20-$30 for a collectors booster pack might now buy a few (or a box) in the hopes of opening such a special card
Just in case, the price of cards like Final Fortune (though Blue-adjacent cards are better than Red ones) or Sundial of the Infinite (which goes in Blue decks)
Other cards with Star Drop Cards by imoniii Frequently Asked Questions How can I obtain the Minior with 1-Star rarity from the Celestial Guardians set
Eternal Witness is good for the same reasons, and its also a creature, so you can tutor for it and you can target it once its on the battlefield