Najeela and Sophina do not have summoning sickness.
You control at least one other nontoken creature that can attack this turn.
An opponent is unable to block and kill creatures you control.
Steps
Declare Najeela, Sophina, and at least one other nontoken creature as attackers.
Sophina and Najeela trigger.
Resolve the Sophina trigger, creating at least three Clue artifact tokens.
Resolve the Najeela trigger, creating at least one 1/1 Warrior creature token that is tapped and attacking.
Activate Krark-Clan Ironworks three times by sacrificing three Clue tokens, adding ({6} magic symbol) .
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.