Nightmare Lord Xavius: Impressions

It looks like this card is seeing play in basically every deck, mostly as expected, it's basically birdwatching on a stick with an even stronger effect and has sometimes won me the game on the spot (lifesteal on ursoc is wild, turns out), and you can also use it to get stats on the board to slow aggro down. I am very impressed. How about you guys, what are your thoughts and impressions? Do you think ot will become a staple?