This is The Fire Plume’s Heart HS Warrior Quest Card from the Journey to Un’Goro expansion due for release in April.
The card reads: Quest: Play 7 Taunt minions. Reward: Sulfuras.
Sulfuras
This is the Sulfuras HS Warrior Card from the Journey to Un’Goro expansion due for release in April.
It’s a Warrior class weapon and the card reads: Battlecry: Your Hero Power becomes ‘Deal 8 damage to a random enemy.’
You can get Fire Plume’s Heart by opening packs from the Journey to Un’Goro set.
If you want to know more about how the Quest keyword works check out this post.