What it does
I'm not familiar with "Strike a Deal" as an official Magic: The Gathering keyword or ability, and I don't want to invent rules that could mislead you during a game.
It's possible you're thinking of a similarly-named mechanic, a card with "deal" in its name or text, or perhaps a custom/unofficial card. A few things it could be confused with: Deals in the Unfinity set context, the "the ring tempts you" mechanic, or cards that involve voting/political negotiation like Council's Dilemma or Will of the Council.
If you can share the exact card name or where you saw "Strike a Deal," I can give you an accurate, rules-correct explanation of how it works and when it matters in Commander. I'd rather verify than guess on something that affects your games.
Iconic cards with Strike a Deal
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