What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Wave Cannon." This doesn't correspond to any official MTG keyword, ability word, or recognized mechanic that I can confidently explain.
It's possible you're thinking of a specific card name rather than a keyword—or perhaps a card from another game entirely (the term "Wave Cannon" appears in some video games and other trading card games). It could also be a misremembered or homebrew/custom term.
To give you accurate information, could you clarify? If it's a specific card, let me know the exact name and set, and I can explain how it functions. If it's a mechanic you encountered, any extra context (like the card's text or where you saw it) would help me point you in the right direction rather than risk inventing rules that don't exist.
Iconic cards with Wave Cannon
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