Power

Card power
The power of a card is the average of its attack value and one third of its health. This value is rounded up to nearest integer. Power = ceil[(Attack + Health / 3) /2] where ceil is the ceiling function (round up to nearest integer).

Deck power
Deck power is the sum of the power of all cards in the deck, including set bonuses.

Card stats
Stats are affected by number of stars and card level. Each star increases stats by 100% of base value. Each level increases stats by 15% of base value. Base values are listed in table of cards.

Attack
Attack = ceil[BaseAttack * (Stars + 0.15 * Levels)]

Health
Health = 3 * ceil[BaseHealth * (Stars + 0.15 * Levels)]

Example
Shaman level 3, 3 stars: BaseAttack = 55.0

Attack = ceil(55 * (3 + 0.15 * 3)) = ceil(189.75) = 190

BaseHealth = 45.0

Health = 3 * ceil(45 * (3 + 0.15 * 3)) = 3 * ceil(155.25) = 3 * 156 = 468