Please update the UI to make use of the available screen estate on mobile devices.
The current UI is clearly designed for desktop with large monitors.
Crafting on mobile is near-impossible because setting filters, typing search entries, selecting cards is all so difficult on a small touch interface.
Another example is the Mulligan interface.
The relevant part of the UI is the cards in hand, yet these make up less than a quarter of the screen. Instead it shows a deck which serves no purpose at all on this screen, a slider and lots of empty space.
Please show only the cards in hand and allow the user to tap a card to select it to discard it. We know it will go in the deck.

Same is true for the "Play" screen. Most of the screen is used to displayed (beautiful) graphics that have no gameplay relevance, while the actual areas to use are tiny.

And the screen to open "packs" as well. Again mostly it is eye-candy, floating cards, cards to be flipped over. sparkles and other irrelevant stuff while the cards cannot be read.

A minimal/game focused UI is IMHO very much needed, especially on mobile devices.