Premium Cards need balance 
such:
Golemcave nerf on hitpoints
Zabbies hut Puff on hit point
… You Know Because of Hit Points of Golemcave is Double of Zabbies Hut’s Hit points
So if Goldmcave nerf ( 30 % - 60 % ) hit points will be better for the balance of The Game
and Zabbies Hut Puffed ( 25% - 70 % ) on hit points