Turn-Based Action

Turn-based actions are game actions that happen automatically as the turn progresses.

General rules
702.1 Turn-based actions are game actions that happen automatically as the turn progresses. It is not possible to handle other effects until the turn-based actions have been dealt with.

702.1a Abilities that watch for a specified step or phase to begin are trigger abilities, not turn-based actions.

702.2. Whenever a step begins, if it’s a step that has any turn-based action associated with it, those turn-based actions are automatically dealt with first. This happens before state-based actions are checked, and before triggered abilities are resolved.

702.3. The turn-based actions are as follows:

702.3a The active player untaps his cards in the battle zone and the cards in his mana zone. Then all the trigger abilities that trigger at the beginning of the turn are resolved.

702.3b Immediately after the draw step begins, the active player draws a card.

702.3c Immediately after the attacking creature declaration step begins, the active player will attack attack Designate.

702.3d Immediately after the block creature designation step begins, the nonactive player blocks Specify the creature.