MArcomage

How did I know that this would be Burninator's doing? :P

Interesting idea.

Troll deals 14 damage for 6 recruits, this one can deal 20 damage with 6 gems. The condition is not so hard met and the fact that it uses up gems means it can leave recruits growing for a charge attack once the wall is down. And don't forget that the conditions of this card can be met pretty easy. I can accept Troll, but this can be devastating. It's a brilliant idea, but it's a bit overpowered

But even if you do get to the point where the enemy's wall is divisible by 4, the enemy can quickly foil your attack with most wall-building cards (even militia). Also, the -8 wall part obviously stops being useful once the enemy's wall is 0.

Maybe it is a little powerful compared to most offensive gem cards though, since they usually provide you with some side benefit (swift, extra production, reducing enemy stock, increased facilities) along with a semi-weak attack, rather than just being purely offensive.

If anything, I would keep the idea, and maybe just reduce the base attack and/or enduring amount.