MTG card data and images courtesy of Scryfall. Artwork © Wizards of the Coast. How we price.

UNH · #14 · uncommon · {W}
Instant
You and target opponent play Seven Questions with the top card of that player's library. If you win, prevent all damage that would be dealt this turn by a source of your choice. (To play Seven Questions, that player looks at the card, then you ask up to six yes-or-no questions about the card that they answer truthfully. You guess the card's name—that's question seven—then the player reveals the card.)
LEGALITY
No listed paper-format legality.
TCGPlayer market (Guide)
One observation so far — today's. A single point is not a trend; the line grows a point per day from here.
Guide
$0.31
TCGPlayer Near Mint market. Not a sold price.
Foil guide
$1.49
TCGPlayer foil market. Separate from the non-foil price.
Recent sold
$0.24
Latest TCGPlayer sale.
Current asks
$2.45
Median of current eBay listings. Asking prices, not sold prices.