Its second ability is Raven's Call, which lets you draw a card during your turn whenever the character exerts
There are a ton of black-based decks that love to sacrifice things (and drain and gain, for that matter), so I think this will see some play
A 5/5 Cat Nightmare Beast with deathtouch and lifelink for five mana, whenever Nethroi mutates, you can return any number of creature cards with a total power of 10 or less from your graveyard to the battlefield
Working Shards of Alara into Constructed play took some time and I expect the same for Khans
If you've already got a lot of cards from The First Chapter, apart from the guaranteed foils in the 2 decks, it might be more cost-effective to put your money towards boosters, unless you're looking to pick up the cards from either of the starter sets quickly, then the fixed nature of the decks will get you those quicker than randomized boosters