The word rascará is the future form of rascar in the third person singular.
See the full rascar conjugation

rascar

No soy el hombre que los rascará, Em.
Well, I ain't the man to scratch it, Em.
Si el codo derecho se acerca a la sien, la mano a la oreja rascará muy bien.
If the right elbow comes up to the temple, the hand will scratch the ear with ease.
Me pedía que le rascara los dedos de los pies.
He used to ask me to scratch his toes.
Durante los meses del verano, mi esposa y yo teníamos que atar sus manos para que no se rascara.
During summer months, my wife and I had to bind her wrists so that Ji-Young wouldn't scratch herself.
Lamento, al igual que algunas de sus Señorías, no haber podido convencer al Consejo de que rascara más en los bolsillos de nuestros contribuyentes para incrementar el gasto en investigación.
I share some colleagues' regrets that we were not able to persuade the Council to dig deeper into our taxpayers' pockets to increase expenditure on research.
Y esto hizo que me rascara la cabeza, porque a medida que repasaba los cientos de páginas de su libro, no podía encontrar una sola cifra, gráfico, tabla, referencia o nota a pie de página.
And this caused me to scratch my head, because as I went back through his several-hundred-page book, I couldn't find a single figure, chart, table, reference or footnote.
El médico le dijo, sobre todo, que no se rascara el eczema.
The doctor told him, above all, not to scratch his eczema.
Le rascará a las chicas, ¿eh, amor?
I bet that scratches the girls, eh, love?
Le pedí que me rascara la espalda.
I asked him if he would scratch my back.
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