I could swear I've seen this idea before... can't for the life of me remember when / where though...
At any rate, this could be quite powerful... maybe to the point of being OP in some cases. As a global effect, it is a serious nerf to non stun / lobo based CC when it comes to skill usage. The fact that it seems to affect both sides is a plus since it will be a double edged sword effect, but I'm not sure that is enough.
There are also a few annoying loopholes to consider:
1) Armagio - As a ghost, this effectively provides a 1 round immunity to creature attacks (except psion and momentum)
2) Fractal-Spark ... *shudders*
3) Shard of Focus (right now, it "dies" upon 3rd use. this is evident from the death effects it triggers upon doing so)
**Granted SoF is currently OP so this may be disregarded, but it helps emphasize the point
4) Rage Nymph - Sparktal *shudders again*
5) Instosis is even harder to cope with
Loopholes and balance aside, I love the theme and overall idea. It just needs some tweaking to rebalance and prevent abuse.
Some ideas off the top of my head:
-Limiting the number of times it could trigger per turn (could be made stackable)
-Change it to a spell card or give a limited duration
-Allow spirits to die from gravity pull effect (this is important or else armagio combo will be OP)
-Oddball idea: The spirits must be "Activated" - e.g. upon dying, the card gets a halo effect put on top of it. The player must click the halo, paying 1 quanta of the cards element, in order to remove the halo and allow the creature to attack or use its skill. This would help mitigate the sparktal problem.