Idea for the game - Multiplayer mode!

Today I realized that the game could greatly benefit from a multiplayer mode. Currently I feel that the game became quite repetitive; regardless of how many levels I advance, the computer always uses the same cards, and makes really silly decisions. The difficulty doesn’t really escalates, regardless of the level.

Now, if you look at how the game is made, it almost feels as if it was intended to be played with other people. The ranks, the little machine that searches for a suitable opponent, and even all the optional cosmetics. People could be able to build their own decks and compete with other players! How awesome would be that? What do you think?