Head to Head is a uncommon Instant card from Unhinged (UNH), collector number 14. Current market price: $0.32 (foil $1.49), TCGplayer market prices via Scryfall.
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.)