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@StuffnSuch existing cards that use X define X explicitly either via their mana costs or their own effect. In your case, you’d need wording more along the lines of “Whenever a spell or ability causes you to look at the top one or more cards of your library, Illiterate Researcher deals that much damage to you.”
@stijnhommes & @12SidedGuy, the ability to ask for mystery boxes with multiple challenges (among a variety of other perks) is a privilege granted to Prestige mystery boxers, which currently includes Corwinnn, Jadefire, and myself (see this post). This is why the Mystery Crate Prize exists, which can temporarily grant anyone else these privileges. That said…
Your mystery box contains: