And so I will now put enough effort into creating a post that will not be closed by administrators.
What is Eternal?
It is a digital card game that is in early access. You can find it on steam. It had a closed beta, which is now over. It is free to play, using a payment model that is similar to hearthstone, though perhaps a little more forgiving about grinding out cards without spending money.
What kind of gameplay does it have
It's basically a compromise between hearthstone and magic the gathering. It's has a lot of the streamline of hearthstone, but puts in a little more complexity like magic the gathering. So, if you don't like how slow and convoluted playing magic (or Hex) is online, but you find Hearthstone to be a little boring or repetitive, then this may be the game for you.
Is it PvE or PvP
Both. You can grind out cards in 2 different PvE modes, or you can play drafts / ranked matches vs other people.
To be honest, I don't know everything about the game. It's still early access and my research is limited. But I am really, really enjoying it. And I will say that for being early access the AI isn't completely stupid which is actually somewhat impressive.
Here is their website:
(I hadn't been to the website before. There isn't much there. Just get the game on steam, it has a tutorial, it's self explanatory.)
Here is a video for those that like videos: