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allow or not a card to be played in a match due to its mana being odd or even, is a little too much...

Why is this any different than limiting the cards that can be played by their attack type or anything else? The idea of the rulesets is just that you have to think and use different cards for every game.

If the game is too complicated, then people stop playing such a game.
Previously, I could explain to my friends how to play this game in 10 Minutes, but now I can hardly understand the rules and the crazy number of cards.

Tell that to Path of Exile players.

I do not see this game in stores and my friends do not play it. This is my first time hearing about her. Either this game has poor advertising or it is complicated and only freaks play it.

5 year olds can learn this game easy, I don't see how new rulesets are complicating the game, it just makes it more dynamic. If you want something static, play chess I guess... Oh wait thats a complicated game, lol.

"crazy number of cards"
??
You don't play card games much, do you?

It is mostly freaks like me playing at the moment but the game doesn't even have an app yet. This is like a pre-release. You should judge how well its doing several months after the apps are out and the advertising has started.

I'm just going to grab Eldritch Battery and Chaos Innoculation. What could go wrong?