Board Thread:Game Discussion/@comment-174.107.123.96-20130717030410/@comment-11948001-20130717083051

The problem is that the x5 (or whatever) multiplier only applies to your attack value and not the defence/health. This makes that card (especially ones that aren't MTM'd) a bit like a glass cannon in that when they do attack it does a lot of damage but they can be taken out really easily. End result is a massive variance in damage caused on identical bosses.