If you want to play a card or not is probably depending on two things:
1) Does it fit your deck?
2) Is there a card with the same skills and less mana or the same mana and more skills available?
And depending on the color you play you can get a feel of what skills are worth how much mana. E.g. when playing a green deck, you should get more attack rating for your mana then playing a white deck.
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