Power Word: Tentacles is a Priest spell card (rarity: common) that belongs to the "Whispers of the Old Gods" set, which was released on 26.04.2016 and is one of initially 134 cards. The artist of this card was Jesper Ejsing, who also made 16 other artworks for Hearthstone.
The card costs 5 mana and its card text reads: "Give a minion +2/+6."
The flavor text of the card is the following: Because you're wrapped in a protective layer of… tentacles?
Based on 91 quiz answers, the card is moderately hard to memorize: 87% of them were correct. The question on “Card text” is answered correctly most often (100%), the one on “Cost” least often (76%). An answer takes 5.3 seconds on average. In the Pixel Quiz, which shows only the shape and colour of the card, it was recognised correctly 67% of the time.