Explorer's Hat is a Hunter spell card (rarity: rare) that belongs to the "Caverns of Time" set, which was released on 31.08.2023 and is one of initially 147 cards. The artist of this card was Joe Wilson, who also made 6 other artworks for Hearthstone.
The card costs 1 mana and its card text reads: "Give a minion +1/+1 and ‘Deathrattle: Get an Explorer's Hat.’"
The flavor text of the card is the following: Harrison Jones was disappointed that he didn't get to be part of the League of Explorers, but his hat did.
Based on 106 quiz answers, the card is easy to memorize: 91% of them were correct. The question on “Name” is answered correctly most often (100%), the one on “Cost” least often (76%). An answer takes 4.8 seconds on average.