they need to introduce more variables so that the gameplay is definitely less predictable.

I'm playing Splinterforge regularly and I quite agree with your statement. You could play Splinterforge with maybe 20 cards in total. I use almost always the same cards and the same 3-4 summoners (Kitty, Lama and Jacek and sometimes Mimosa Nightshade). So if there would be some additional parameters where other types of cards could become useful, it would increase the skill level of the game and make it less predicatable.

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