Jace, the Mind Sculptor #75 borderless : Priced at around $25 foil and $20 non-foil Liliana of the Dark Realms #78 borderless : Priced at around $22 foil and $19 non-foil Chatterfang, Squirrel General #82 borderless : Priced around $23 foil and $14 non-foil What are the most expensive MTG Bloomburrow main deck cards
Stay with Me / Rhystic Study (FCA) $100 WotC's bent on weaving these two Final Fantasy characters into as many I'm not crying, you're crying! moments as they can
On the other hand, for products like Secret Lair drops, Commander decks, or other preconstructed / box-set supplemental products, we used the cost of buying the sealed product (which is generally lower than the cost of buying all of the cards in the product individually) from around the time the set was released (for sealed product, you'll often pay much more if you wait until the set goes out of print to try to buy it)
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Some of the most powerful examples come in the form of commanders like Geist of Saint Traft, Narset, Enlightened Master, and Uril, the Miststalker
By being patient, doing your homework, and using the right tools, you can make sure every purchase is a smart one