Najeela, the Blade-Blossom | Composite Golem | Helm of the Host

Cards

At the beginning of combat during your turn,
Helm of the Host triggers, creating a token copy of
Composite Golem.
Activate the
Composite Golem token by sacrificing it, adding ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) .
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 getting an additional combat phase after this one.
Repeat each combat phase.