I thought on a kind of sundial for darkness:Will-O-wisp0/1 : misdirectionSacrifice will-o-wisp. Creatures do not attack for one turn.
Water: Every turn this creature is alive, remove a poison counter from or add a purify counter to yourself. This wouldn't be OP with fractal because of the buff cards necessary I think...
Air : What about a 3|0 creature granting airborne to every creature on his side of the field while it is alive? Maybe called "an air spirit", "a tornado" or a "zephir".[...] Darkness bis : It could also be a 0|0 creature that makes every creature on his side a creature from darkness while it is alive. It could be named "Dark soul". it would be then very synergistic with eclipse. Death : Scavenger would be a nice ability to buff a 3|0 creature. Could be called "foul stench" and would get worth each time a creature die.
Gravity : [...] For the name maybe "heavy atom".
water : It could be a 3|0 creature that makes every creature on his side a water creature while it is alive. It could be named "air dome". It would be synergistic with flood. You could use creature from the same element of the buff.
Air: Dive could easily be OP, especially with something like blessing. Maybe its ability could be shockwave, which kills itself. But it wouldn't be able to use the ability without a buff. Seems UP though. Maybe just casts shockwave upon death?
For Air , I'm thinking of making it cost 2 /1 with 3 | 0 stats, and the ability will be : All your airborne creatures gain +1|+1 for one turn.Maybe Breeze | ZephyrIt will of course be airborne, so it will be able to keep another Breeze | Zephyr alive while it buffs other cards.What do you think?