Faeburrow Elder and Najeela do not have summoning sickness.
You control a blue and black permanent.
Opponents can not block and kill creatures you control.
Steps
Declare Najeela and Faeburrow Elder as attackers.
Najeela and Raggadragga's second ability triggers.
Resolve the Najeela trigger, creating a 1/1 Warrior creature token that is tapped and attacking.
Resolve the Raggadragga trigger, untapping Faeburrow Elder.
Activate Faeburrow Elder by tapping it, adding ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) that cannot be spent to pay generic mana costs.
Activate Najeela by paying ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.