What is the text of Professor Onyx?
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Magecraft — Whenever you cast or copy an instant or sorcery spell, each opponent loses 2 life and you gain 2 life.\n[+1]: You lose 1 life. Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.\n[−3]: Each opponent sacrifices a creature with the greatest power among creatures that player controls.\n[−8]: Each opponent may discard a card. If they don't, they lose 3 life. Repeat this process six more times.
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