This is the Lakkari Sacrifice HS Warlock Card from the Journey to Un’Goro expansion due for release in April.
It’s a Warlock class spell and the card reads: Quest: Discard 6 cards. Reward: Nether Portal.
Nether Portal
This is the Nether Portal HS Warlock Card from the Journey to Un’Goro expansion due for release in April.
It’s a Warlock class spell and the card reads: Open a permanent portal that summons 3/2 Imps.
You can get Lakkari Sacrifice 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.