What it does
I think you may be referring to "Cleave" or possibly a misremembered keyword—there's no standard MTG keyword called "Catch." However, you might mean "Outlast," "Skulk," or a similar mechanic.
If you're thinking of a specific card or ability and can give me the exact name—or the card text where you saw "Catch"—I can explain it accurately. It's also possible this is a custom or unofficial mechanic, since "Catch" isn't part of the comprehensive rules.
Common keywords people sometimes garble include Cipher, Cleave, Crew, or Cascade. Let me know which one you meant, or paste the card, and I'll give you the plain-English rundown, the rules nuance folks trip on, and how it plays out in Commander.
Iconic cards with ... Catch
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