To unlock new Masters, reach different levels with the other Masters. Have Tigress reach level 3 to get Po. Then get Po to level 3 to get Crane. Gaining levels will also unlocks more cards for your Masters.

The Master that is selected when creating a deck will determine which cards you can add to it. All Masters can use Neutral cards, however but only Tigress can use Tigress cards, only Po can use Po cards, etc.

Various Masters have specializations which limits the cards that are exclusive to their sets. There are some cards with overlapping abilities or abilities similar to others,

You are limited to a maximum of four of the same type of card in your deck, and limited to only two of the stronger cards.

A card's Kickoff skill is activated as soon as a card is played.

A card's Farewell skill is activated when it is removed from play.

All cards have attack and health values. Attack determines how much damage that card deals when attacking or defending and is displayed in blue. Health represents how much damage that card can take before being removed and is displayed in red.

To attack another card or Master, tap and drag one of your cards that has already been activated on top of a target.

To order a warrior guard your Master, tap and drag them over your own Master. When a warrior is guards a Master, your opponent must fight the warrior first unless they use a special ability that bypasses this restriction.