Can Anivia and Warwick attack together to trigger their 'When I attack' effects simultaneously, allowing Warwick to kill units damaged by Anivia?

Ruling: You can attack with both Anivia and Warwick together. Since their 'When I attack' effects trigger at the same time, the attacker decides the order they resolve in, allowing you to have Anivia damage the enemy board first and then have Warwick kill the damaged units.

Sequence:

• Declare both Anivia and Warwick as attackers
• Both 'When I attack' effects trigger simultaneously
• Attacker chooses the order to resolve the triggers
• Resolve Anivia's effect first to damage enemy units
• Resolve Warwick's effect to kill the damaged units

Nuances:

• Attacking with Anivia first in a separate combat would not work because damage is healed after combat resolves