Defect is usually Frost (Glacier, win condition is blizzard), though Lightning is also a thing (and generally more fun). Dark is in a weird place where 1 is good if you don't cycle your deck often, Plasma is generally not great outside of infinite decks and Meteor shenanigans. All for One is viable, but much like some of the Ironclad options, it gets a lot harder on higher Ascensions. Power spam is also a winner, but really, Echo Form is a win conditionall by itself.
Dark is actually kinda funny.
Even if you do cycle quickly, then upgraded dark is still 18 damage after just 1 turn.
Thats pretty good efficiency for only 1 energy.