Cast Cackling Counterpart by paying ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) , creating a token copy of Composite Golem.
At the beginning of your combat phase, Brudiclad triggers, creating a 2/1 Phyrexian Myr artifact creature token, then causing each token you control to become a copy of the Composite Golem token.
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.