Board Thread:Game Discussion/@comment-10287686-20130706155327/@comment-9477730-20130706183652

The problem with full faction bonus is that it only give 20% on Attack power.

Which means you are forced to use weaker health/defence cards to gain the bonus. Most of the time it's not worth it, since all cards dies faster ... ending in dealing with less damage.

I usually apply it on the 3 leader cards (since one or  two  will be a raid) and gain the 5 or 10% bonus instead.