What it does
Abraxas isn't a Magic keyword or official ability—it doesn't appear in the comprehensive rules or on any printed card. You may be thinking of a different term, a custom/fan card, or a card from another game entirely.
If you encountered "Abraxas" in a Commander context, it might be a homebrew or a misremembered name. A few possibilities to check: are you thinking of a specific card's name rather than a mechanic? Or perhaps an ability like "Annihilator," "Affinity," or "Absorb" that sounds similar?
To give you an accurate rules breakdown, let me know the exact card or where you saw the term. If you can quote the card's text or name, I can explain how it works, the common rules pitfalls, and its relevance in EDH games.
Iconic cards with Abraxas
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