I only tried the Celestial deck, so the things the stand out are Assist and Oblivion. I'm still not clear on what Assist is/does. Is there some base effect, or do you only get the action printed on the assisting card? And there's a card that converts "bonus" attack, and I could never figure out what that meant. Activating the ability never seemed to do anything that I could see. I love the different power in different zones idea, and could see a lot of ways that would influence deck building and play, but that concept didn't become clear for a while. A lot of this could be remedied by a progressive playable tutorial--possibly some of this was explained right at the start, but I didn't retain it because there was so much at once. An interactive tutorial and tooltips would solve most of the problems I had with the game.
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Thank you for the info, it will be vital in growing the game! I'll definitely make a more fleshed out tutorial in the future, I admit for now it's more of an information dump and can become overwhelming.
"Assist" makes so the assisted card buffs its stats by the same amount of the assisting card, and lasts until the end of the next turn, and "Bonus Attack" are just atk increases gained through effects, like Sol's or Luna's (Assist buff doesn't count towards this). I'll also definitely add tooltips for these keywords or ones that may explain more advanced rulings in the future!
Stay tuned ;)