@poetic_one, I disagree on your point a bit about the limit of cards different elements have between each other. Just because a few has more then others doesn't mean the cards would be useful for a deck you wish to build. Creativity doesn't come from building just Mono decks but from building unique Duos, Trios, and rainbows which aren't rip off from the elements official forums/wiki.
@joaovitorsantos, Follow this topic (http://elementscommunity.org/forum/index.php/topic,1190.0.html) till you reach needing to beat a FG which you can then use Mono Aether as you just want to get the badge.
@mrqs2000, To increase your hp max you can use Stone Skin and Shard of Divinity which you can then use Hp regeneration cards like Miracle, Heal and others.
@ChickenMayBite, I am sure there is 1 shard for each element leaving SoI to be paired up with Earth and even the image of the golem suggests earth as well as the card template.