What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Field Reprogramming." This doesn't correspond to any official MTG keyword, ability word, or mechanic that I can confirm exists.
It's possible this is a made-up term, a misremembered name, a card-specific ability I'm not recognizing, or content from an unofficial/custom set. If you can share the exact card text or where you encountered it, I can help interpret how it works under standard MTG rules.
For reference, real keywords that govern board changes or "reprogramming"-style effects include things like Transform, Adapt, or Modular—if any of those is what you meant, let me know and I'll explain it properly for Commander play.
Iconic cards with Field Reprogramming
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