The phrase "a powerful pair of" is correct and usable in written English.
It can be used to describe two items or entities that are strong or effective together, often in a metaphorical sense.
Example: "The team showcased a powerful pair of strategies that led to their success in the competition."
Alternatives: "a strong duo of" or "an impactful couple of".
The National League Championship Series, which pits the Houston Astros against the St . LouisCardinals, features a powerful pair of No. 2 hitters.
Mahalia Jackson The Queen of Gospel fired up the crowd with a powerful pair of selections, "How I Got Over" and "I've Been 'Buked and I've Been Scorned".
One of the soldiers who gave his evidence had seen the march going by and had a powerful pair of binoculars.
It reminded me also of the experimental film Bullet in the Head (2008), by Jaime Rosales, where the characters are seen as if through a powerful pair of binoculars.
If Davenport had a powerful pair of binoculars, or maybe a telescope, she would be able to pick out an older gent in an usher's uniform working the third-base side of the upper deck way down there in the ballpark.
"A powerful pair of spectacles has sometimes sufficed to cure a person in love," Friedrich Nietzsche said.
It's a fantastically powerful pair of stories, very sophisticated in its structure, if slightly crudely manipulated by its librettist".
It was a third straight victory for the Giants, after they had fallen 12-0 behind to early tries from Castleford's powerful pair of Michael Shenton and Justin Carney.
Gone was the powerful pairing of David Tennant's terse, impatient DI Hardy and the sympathetic Detective Sergeant Ellie Miller made affectingly human by Olivia Colman.
Although he has the enthusiastic support of the prime minister, some other cabinet ministers, including the powerful pairing of the chancellor, Gordon Brown, and the foreign secretary, Jack Straw, are sceptical if not downright hostile.
