An opponent cannot block and kill Ganax or Najeela.
Steps
Declare Ganax and Najeela as attackers.
Ganax's myriad ability triggers, as well as Najeela's first and myriad abilities.
Resolve the first Najeela trigger, creating a 1/1 Warrior creature token that is tapped and attacking.
Resolve the Najeela myriad trigger, creating a token copy of it tapped and attacking each other opponent.
Put all Najeela tokens into your graveyard due to the legend rule.
Resolve the Ganax trigger, creating at least two token copies of it tapped and attacking each other opponent.
Put all Ganax tokens into your graveyard due to the legend rule.
The Ganax tokens enter the battlefield, triggering each Ganax a number of times equal to the number of tokens created.
Resolve all Ganax triggers, creating at least six Treasure tokens.
Activate five Treasures by tapping and sacrificing them, 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 gaining an additional combat phase after this one.