All those who propose card trading: keep in mind, that you can't have trading cards at the same time with per-player rewards (such as daily reward, warbonds compensation for server downtime etc) - that would be too easy to abuse through bots.
Sonofthefire, the benefits are implied by more efficient use of "Rally (faction)" and "Heal (faction)" cards. If you don't use them, then there's no benefit in monofaction deck.
Perhaps, replenish some energy if a battle was fought perfectly (i.e: no hits lost - 20% of spent energy restored, no assault cards lost - 30% of spent energy restred, both conditions fullfilled - 50% of spent energy restored)?
Continuous respawn is really irritating, and makes game so much really more an arcade, than a puzzle (while in Bomberman the proportion was often different)
Does taking Youth Berry affect ending in some way?
I didn't take it and used just normal endurance - I had to be very quick though - because I supposed, that it may be some malicious trick