This is the 9722nd most frequent Portuguese word.
custará
"Custará" means "will cost."
In this sentence, 'custará' describes the figurative cost in terms of effort required for the plan.
Se continuarmos com esse plano, custará muito esforço.
If we continue with this plan, it will cost a lot of effort.
The term 'custará' conveys a metaphorical loss or price paid in terms of trust in friends.
No final, isso me custará confiança nos meus próprios amigos.
In the end, this will cost me confidence in my own friends.
Here, 'custará' is used to express future prediction about the price of the car.