First step we need to create the game mechanics.
Mana generation:
I don’t like the magic mana mechanic so I will use another type of mechanic.
I will use the 1 turn > 1 mana I (called mana to be easier to represent)
So if we are in turn 5 we have 5 mana points to spend, if we here in the 10 turn we had 10 mana, and go on.
If we spend mana in the next turn it will replenish.
With this we get a easy way to generate some mana.
Creatures
Next we need some soldiers to fight for us. Creatures and each creature should have one of the followings attributes:
Tolerance level - number of copies of a card per deck.
Speed level- the chance from escaping from the battle field to the hand.
Rage level- the chances of distributing the first blow
Damage level- the damage provoked in an attack
Life-life of a creature
Cost-the cost of a creature
Creature type- the type of a creature
Special abilities- this is optional.
We need also some value to make the deck balance maybe call it Card value.