What it does
I don't recognize "Angelo Cannon" as an official Magic: The Gathering keyword or ability. It doesn't appear in any rules set, card type, or mechanic that I'm aware of.
It's possible you're thinking of a specific card name, a misremembered term, or something from a custom/unofficial set. A few things it might be confused with: Aetherflux Reservoir (the famous "life-cannon" combo card), or perhaps a homebrew creation specific to a playgroup.
If you can share more context—like where you saw it, the card's full text, or the set it's from—I'd be happy to explain the actual mechanic. I'd rather not invent rules for something that doesn't officially exist, since that could mislead you during a game.
Iconic cards with Angelo Cannon
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