What it does
I'm not aware of "Spore Chimney" as an official Magic: The Gathering keyword or ability. It doesn't appear in any rules set or card I can verify, and it may be a misremembered name, a fan-made term, or something from an unofficial source.
If you can give me the exact card name or where you saw it, I can help clarify what's actually going on. It's possible you're thinking of something Saproling- or fungus-related (like cards that make Saproling tokens via "spore counters," seen on Thallids), or a chimney/sacrifice-style outlet—but I don't want to invent rules for a term that isn't real.
To keep things accurate for your Commander games, I'd rather point you to the correct mechanic than guess. Share the card and I'll break it down properly.
Iconic cards with Spore Chimney
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