Courage means that if you are the first to attack (which happens 2x during a match) it will get +3 power. This stacks with Ulu Wata's +2 power so that means you will gain +5 power on any of them. But some of the cards that have like 3 or 4 power and deal liek 8 damage benefit greatly from Ambre. I like pairing her with That hog guy that can deal 12 dmg.
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