Planeswalkers are powerful allies you can call on to fight by your side. But how do they work?
Planeswalker cards are shuffled into your deck at the start of the game, just like any other card. You can cast a Planeswalker during either main phase of your turn (or any other time you could cast a sorcery spell). A Planeswalker is a permanent, so when a Planeswalker spell you control resolves, it enters the battlefield under your control. (Note that Planeswalkers are not creatures.)
Anatomy of a Planeswalker Card
Planeswalker cards differ from most other cards. Taking a look at a card, you'll see: