To understand Ambre's courage ability, you would have to first understand how Courage works.
Courage, is an ability, that Adds its value to the Power of the card, while the card is the first card played in a round(that is round, not the whole game) so, assume you have 4 cards,
First round they go first, and play Boris, you play Marlysa Cr
Second round, you play first Windy Mor
, they play Splata, you play enough pillz to beat Splata...
Third round, they play first, with Miss Ming
(courage kicks in increasing Mis mings Power), you play Otakool
, which Stops courage, therefore Miss mings power is back to normal.
Final Round, you play First Elya, Courage 5, so Elyas power is increased, sinc you play first in the round. and they play some random card...
Now, some Leaders will give all of your cards a bonus, and others will give you a bonus...
, gives all of your cards Courage 3, therefore any card you play first in the round(which in the example above would have been Windy Mor
, and Elya) will get +3 power, which cannot be negated by stop ability or stop bonus cards.