I see some problems here.
For starters, as soon as I saw the effect of this card, immediately I started to think that there has to be an OP combo with this card. Sure enough, I found the most the most powerful shields you can use with this card, which would be Titanium Shield / Diamond Shield | Spine Carapace / Thorn Carapace | Procrastination / Turtle Shield. These would be the most powerful components since they add hit deduction and creature control. Of course some of you may be thinking that shields such as Bone Wall and Dimensional Shield could work. They won't for the simple fact Dimensional Shield will cause any effects of the secondary shield not to take effect (except for reflective shields) and Bone Wall isn't that powerful and would only add seven free hits. Of course when combined with shields like Procrastination, Bone Wall could be effective.
So, I think I may have found some combos that just stand out.
Fire Wall + Spine Carapace
I found this to be a powerful combo created with this spell because it is basically a damage combo and acts as mass CC for most of the creatures attacking. While each creature that attacks receives one damage deduction to their health, they also run the risk of being poisoned, which in addition to the one damage each turn, can kill creatures rather fastly and take down big creatures such as Dragons in a couple of turns. This makes one more synergy for Life and Fire.
The thing with this combo, and most combos here will be that these combos are expensive and will probably take a while to pull off.
Diamond Shield + Dusk Mantle / Fog Shield
Diamond Shield is already in the same element as this spell card. It wouldn't be that much of a hassle to build a deck that would incorporate either Dusk Mantleor Fog Shield. This is rrather obvious. In addition to the massive damage deduction, the enemy also runs the chance of missing each of their attacks. This is a powerful combo, since adding a chance to miss to an already powerful shield would basically make most attacks useless.
Turtle Shield + Permafrost Shield
I don't think this is much of a powerful combo, but just think about it. Every time the creature hits you, they are automatically delayed plus what of they had a chance of, instead of being delayed, to be frozen instead? This just stands out to me.
I also found some pretty crappy combos.
Dimensional Shield + Any Non-Reflective Shield
Dimensional Shield's effect will cause all physical attacks to miss. So combining it with any shield that isn't Jade Shield or Mirror Shield is pretty pointless.
Jade Shield + Mirror Shield | Shield (Other) + Diamond Shield | Dusk Mantle + Fog Shield
I'm thinking if this card were to actually be added, then these combos wouldn't stack since the most latter would basically be a permanent Dimensional Shield.
If not, have fun wrecking the meta.
Solar Shield + Dissipation Shield
Sure, you are most likely using the effects of Solar Shield to power the effects of Dissipation Shield, but if you are actually trying to use your Light quanta to summon creatures, then you would find it to be very unfortunate as this combination of shields eats up all of your Light quanta. That would be a mistake along the lines of playing Shard of Sacrifice, then playing Miracle
Of course I could be wrong on most of these. Though, a couple of questions I have:
Which shields are prioritzed over others?
Say I have two shields. Which effect is used over the other? Those this won't matter most of the time, it's nice to know the order of things.
Since the next shield takes the effects of the previous shield, can a shield take the effect of a hybrid shield?
Say I already have a shield with the effects of two. Can I use the spell again to create a shield with three effects?
Does immaterialism transfer as well?
If a shield is immaterial, would that transfer?
If the shield is stolen, do the additional effects transfer with it or does it go back to it's original state?
Self-explanatory.
Overall, I think this card is a good card and I would like to see it implemented into EtG. I say that for a lot of cards but I'm pretty sure this card hasn't been made before and is an original idea. I do get bothered about the fact the first shield I play just vanishes without any effect when I play the second and thus card would be my cure for that. Excellent job.