Declare attackers step

The declare attackers step is a step of the combat phase, where creatures may be assigned to attack.

Creatures assigned in this step are attacking.

Attacking twice
An extra attack (Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.) is primary in red and tertiary in white.

Can't be attacked
A rarely used mechanic keeps you from either being attacked for a turn or as long as a specific permanent is on the battlefield. This effect is primary in white and secondary in green.

Forced attack
Forcing a target creature to attack is primary in red and secondary in blue. Red is flavored as emotional tampering and blue as mind control.

Must attack
Creatures that must attack every turn if able are also primary in red. Since the gameplay is not always great, R&D has been scaling this feature back in red overall.