Rallying Blade is a Paladin weapon card (rarity: rare) 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 Jeremy Cranford, who also made 2 other artworks for Hearthstone.
The card costs 3 mana, has 3 attack and 2 durability, and its card text reads: "Battlecry: Give +1/+1 to your minions with Divine Shield."
The flavor text of the card is the following: As far as blades go, this one is pretty great in the motivation department.
Based on 103 quiz answers, the card is easy to memorize: 90% of them were correct. The question on “Name” is answered correctly most often (100%), the one on “Durability” least often (82%). An answer takes 7.2 seconds on average. In the Pixel Quiz, which shows only the shape and colour of the card, it was recognised correctly 100% of the time.