What are the abilities of Gix, Yawgmoth Praetor?
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Whenever a creature deals combat damage to one of your opponents, its controller may pay 1 life. If they do, they draw a card.\n{4}{B}{B}{B}, Discard X cards: Exile the top X cards of target opponent's library. You may play lands and cast spells from among cards exiled this way without paying their mana costs.
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