Yeah that could work. So could "Go away," said once.
Any collection of words work, infact, even words you can't read or know work, as long as the caster has the focus, intent, as well as the skill. Some people find it much easier to use words they know or use rhymicpatterns and rhymes for flow, ease, and invoking a trace like state (mostly for longer rituals but saying a spell long enough and rhythmically works too and can help with mediation if it's simple enough). Not to mention that rhyme and rhythmmake spells easier to remember for those who enjoy reusing the same spells and not having to remake them.
I don't believe an older spell is more impressive or powerful than any other spell made becausespells are just collections of words. It's the intent and personal touch that makes them empowered. In my opinion, it doesn't matter how "old" a spell is. All spells work the same if their intent and focus are the same. There are other factors, but age seems to be more of a thing of preference. Some people prefer to treat old spells with reverence and respectdo to their age. Others who prefer older spells might enjoy older languages,have a religious/emotional connection to the spell, or might just feel more empowered/untuned to the past when casting with an older spell. But the modern-spell casters are just as effective.
The most effective spell for each casteris the one writtenby you with intent, that is casted for you at this moment with focus and intent. Things such as your own familiarity with the spell or your own personal connection to the spell will personally help you cast it, though won't have much help with others. This is why calling to entities you believe in, noting animals you have a connection to, or casting for something you feel passionateabout, etc has the most effective results.
But I find the most effective way to tell a generic spirit to leave tois just politelytell them to. They tend to get it.