What it does
I'm not aware of "Time Compression" as an official Magic: The Gathering keyword or ability. It doesn't correspond to any standard rules term like Flying, Trample, Cascade, or even mechanics like Suspend or Vanishing that interact with time counters.
It's possible you're thinking of a similarly-named card or mechanic. For example, Time Spiral and Timetwister deal with shuffling hands and graveyards back into libraries, while Suspend uses time counters that tick down each upkeep. There's also custom or unofficial content—some homebrew sets and Un-cards invent flavorful keywords that aren't tournament-legal.
If you can tell me the exact card name or where you saw "Time Compression," I can give you accurate rules text and Commander applications. I'd rather not invent rules that could mislead you at the table.
Iconic cards with Time Compression
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