What it does
I'm not familiar with "Invasion Beams" as an official Magic: The Gathering keyword or ability, and I don't want to invent rules that could mislead you.
It's possible you're thinking of something from the March of the Machine set (which featured the Phyrexian invasion theme), or perhaps a custom/fan-made card or a misremembered name. There were Battle cards (specifically Sieges) introduced in that set, which are a newer card type tied to the invasion storyline.
If you can share the exact card name or where you saw "Invasion Beams," I can give you an accurate rundown of what it does, the common rules misunderstanding, and how it plays in Commander. I'd rather get you the right information than guess.
Iconic cards with Invasion Beams
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