Depending on your playing style,
Leader cards except
Hugo aren't well suited for
ELO decks.
They take too many resources and give too little back.
In my opinion if you are going to use a
Leader card this is the order to use it and when.
Hugo - General
Ambre - If you don't have
Hugo Maxed.
Morphun - If you're play style is that of a pill hog.
Bridget - If you have a defensive deck (light on Attack, heavy on damage)
Timbre - If you have an offensive deck (Heavy on Attack, light on damage)
Ashiguru - not worth it.
Vansaar - Only in EVO decks.