The phrase "a powerful tactic" is correct and usable in written English.
You can use it when discussing strategies or methods that are particularly effective in achieving a goal.
Example: "Using social media to engage with customers has proven to be a powerful tactic for increasing brand awareness."
Alternatives: "an effective strategy" or "a strong approach."
Intimidating businesses is a powerful tactic.
As empires grew and their armies became too large to live off the lands through which they passed, disruption of their supply fleets also became a powerful tactic.
But the minute you have some kind of publicity coming out, against an enemy who can be shamed, then non-violence can be a powerful tactic.
Together, it seems that the synergistic inhibition of histone and DNA methyltransferases by Geminivirus proteins evolves as a powerful tactic to win the arms race between host and pathogen.
But for ZANU-PF, which under the power-sharing agreement retains control of the most powerful levers of government — the army, the police and the intelligence service — indigenization could be a powerful political tactic.
One powerful tactic that I have used in all of my transformations is the re-creation of the environment.
This will a group of good, respectful students, who work against chavs using more powerful tactics than just pure violence and unintelligible language.
Making use of the powerful tactics of the Web, I'll start each chapter by typing a 140-character Tweet -- to myself.
Bennett and Hytner seem to have felt, in common with many other creative professionals, that the intensive multimedia publicity business is increasingly disabling two of the most powerful tactics of narrative art: surprise and suspense.
Chernicoff pointed out that "meeting people where they are" can be one of the most powerful tactics.
BEIJING — Chinese consumers are responding to a powerful new marketing tactic that plays to a widespread fear of food contamination: the promise of safe groceries sold online.
