Najeela and Savage Ventmaw do not have summoning sickness.
An opponent is unable to block and kill Najeela and Savage Ventmaw.
Steps
Declare Najeela and Savage Ventmaw as attackers, triggering their abilities.
Resolve the Savage Ventmaw trigger, adding ({6} magic symbol) .
Resolve the Najeela trigger, creating a 1/1 Warrior creature token that is tapped and attacking.
Activate Najeela by paying ({5} magic symbol) , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.