What it does
I don't have a Magic: The Gathering keyword or ability called "Devour Intellect" in my knowledge—it doesn't appear to be a real game term. You may be thinking of something else.
There's an actual keyword called Devour (a creature enters with extra +1/+1 counters by sacrificing other creatures as it's cast), and there's a spell named Mind Rot and similar discard effects, but "Devour Intellect" isn't a recognized mechanic or card.
If you can point me to the specific card or set, I'm happy to explain the correct ability. If you meant Devour, let me know and I'll break down how it works, the common rules nuance (the devouring creature must already be on the stack/entering, and tokens count), and why it matters in Commander.
Iconic cards with Devour Intellect
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