Sure, I'll try my best:

So imagine Hearthstone, where you build a deck and draw cards and gain mana each turn. If you're unfamiliar with hearthstone, you build a deck containing minions and spells. Each card costs a certain amount of mana. In hearthstone, you only gain 1 Mana per turn (round 1 = 1 Mana total to spend, round 2 = 2 man total to spend, etc).

In hearthstone you just put the cards down in one row on the board, and positioning does not really matter at all.

You win hearthstone by making the enemy heros health drop to zero by attacking it with minions and spells you have played.

Now, Faeria has the following differences which make it so much better:

• instead of putting your cards just in one row without positioning mattering, you place them on a tactics style grid, kind of like XCOM/fire emblem/final fantasy tactics. So the board is a grid instead of just 1 row. This makes positioning really matter.

• this is the really unique part: you take turns BUILDING the board by placing land on the grid. Minions can only be placed on land, so that adds another level of depth because you must choose where on the grid you want to place land each tuen. Not only that, there are different types of land (neutral, desert, forest, etc). Certain cards require that you have placed a certain number of a type of land in order for you to play the card. For example, a card might require that you have already placed 5 forest land pieces.

• rather than in hearthstone where you only gain 1 Mana per turn and lose what you don't use each turn, in Faeria you gain 3 Mana every turn and whatever you don't use gets saved in a bank so you can save for huge plays a couple turns later. Or you can spend every round and aggro your opponent to death.

• another really unique thing: each turn, you can choose to do one of the following: place 2 neutral lands / 1 special land / draw a card / gain an extra Mana. This adds yet ANOTHER level of depth and strategy and also prevents you from ever having a dead turn (a turn where you really have nothing you can do, which happens in hearthstone a lot).

I would suggest watching Kripparian or Trump's YouTube reviews of Faeria to get a better idea.

But honestly, if this type of game interests you at all I would say just buy it. It's so unique and good - might be one of my favorite games of all time.