Already a new keyword? Intresting, but I hope 
Alliance and 
Runic will be supported in next update.
I write again here my suggestion for 
Horde
each time you play an horde card you get 0 tokens+10 tokens for every other horde in hand (so you need more than one horde to increase tokens). 
each time an horde is played you lose N random resources (N=horde tokens/10). 
when tokens =100: 4 bonus attack for every other horde in hand
But now I think it's a too strong bonus. so I change this: 
when tokens =100: N bonus attack for every other horde in hand 
N based on played card rarity (c:1;u:2;r:4)