Seafloor Gateway is a Mage spell card (rarity: rare) that belongs to the "Voyage to the Sunken City" set, which was released on 12.04.2022 and is one of initially 135 cards. The artist of this card was Konstantin Turovec, who also made 143 other artworks for Hearthstone.
The card costs 3 mana and its card text reads: "Draw a Mech. Reduce the Cost of Mechs in your hand by (1)."
The flavor text of the card is the following: It's all about e-fish-ency.
Based on 43 quiz answers, the card is easy to memorize: 95% of them were correct. The question on “Card text” is answered correctly most often (100%), the one on “Cost” least often (89%). An answer takes 7.5 seconds on average. In the Pixel Quiz, which shows only the shape and colour of the card, it was recognised correctly 83% of the time.