I think it was taken from Lanidraks Hemmy first, and then twisted by WoW. :p It's nice but I don't like the way it does an x% extra damage. Not really in keeping with the creatures who often do 1, 2, 3, 4 or 5 damage. Rather make it so that every attack that hits this opponent causes 1 or 2 or 3 extra damage. That'll be a lot more fitting, considering you have shields such as Titanium, which reduce incoming damage by 3. Instead of reducing incoming damage by say 50% if you see what I mean?
Secondly, if it is a permanent that you play, then it is a bit mis-leading to have a card called "Shatter Armour" on your side of the board. To me, that seems like my armour is shattered. Reword it, so that instead of 'shattering your opponents armour' it, 'increases your creatures attack on that opponent'.
Rallying Cry: All attacks which hit your opponent at the end of this turn deal 2 extra damage.
Otherwise, it's nice
. My problem with the 150% extra damage is, I have 24 skeletons in play. That is 24 damage. I play this, and my opponent then takes 150% damage. Is that rounded up or down? IE. Will 1 skeleton attack and do 1.5, will that translate into 2 or 1 damage? Or is the 150% applied to the total damage your opponent takes that turn, then added on as an extra attack? IE. All my 24 skeletons attack and my opponent takes 24 damage, then he takes 150% extra which is 12. Meaning I hit for 36?
I just think it will be simpler to have it do +2 damage on each attack?
My thoughts.