They definitely need more cards; they have much less than other elements. A few strange creatures and mediocre situational spells should do it. Examples:
Jolt / Shock
3
/ 2
Remove all status effects (Momentum, Poison, Grav Pull, Adrenaline) from the target creature. It loses 1 health. /
Remove all status effects (Momentum, Poison, Grav Pull, Adrenaline) from the target creature. It loses 1 health.
Hyperjump / Teleportation
7
/ 6
Target opponent creature comes to your side of the field and is afflicted with the status "Dimensional" which brings it back to your opponent's side of the field after 1 turn /
Target opponent creature comes to your side of the field and is afflicted with the status "Dimensional" which brings it back to your opponent's side of the field after 1 turn
You know, simple stuff like this. Also creates synergy.