Can someone please improve and slim down my destiny/elemental hero deck? ?

yes, staples are neccesary. My philosophy on heroes: keep elemental heroes apart, keep destiny heroes apart, keep neo spacians with neos apart keep evill heroes mostly apart. If they all mix together, you end up with a huge, heroic, fusiony, effecty, contact fusion, evil mess. There are so many heroes out there, it is difficult to put them all into one deck effectively. If you stick with one sub-archetype (you could say), making a good deck is tons easier. then, you can add staples.