Part of me thinks this card is a little too good for the cost, but I want to be proven wrong
Historical patterns suggest 20-40% appreciation post-OOP
This makes it easy to both build a powerful inkwell and quickly gain lore, but rapid inkwell filling can also deplete the available cards in any hand
You'll also get to make use of any enter-the-battlefield or death triggers those creatures feature (note, as Deadpool's ability is a replacement effect not a triggered ability, Deadpool enters with the text box he's stealing, so can copy ETBs)
Second, some of the cheap mythics (like Prossh, Skyraider of Kher) are actually pretty valuable in foil, since Masters 25 is their first foil printing and the primary demand for these cards is from Commander, and Commander players love their foils
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