Or you can activate the ability once, see what youve drawn, play it, and decide if you want one more card
If a creature's power is less than 0 when it's doubled, instead that creature gets -X/-0, where X is how much less than 0 its power is
Play the card and find out
Champion of Dusk is also a consideration at that point, although it takes the slots of possible Cavaliers, which seems stronger at face value

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