Crystalline Crawler has at least six +1/+1 counters on it.
Bright-Palm and Najeela do not have summoning sickness and cannot be blocked and killed by an opponent.
Steps
Declare Bright-Palm and Najeela as attackers, triggering their abilities.
Resolve the Bright-Palm trigger, doubling the number of +1/+1 counters on Crystalline Crawler.
Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) .
Resolve the Najeela trigger, creating a 1/1 Warrior creature token that is tapped and attacking.
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.