As I mentioned in Chat, the two effects could easily be split up into two different shields. I like both the effects though.
And congratulations on posting your first card idea!
Scaredgirl, similarly, feels that the Weapon Swap effect and the Chaos Seed effect are too unrelated to find a home on the same card
The reactive Chaos Shield effect could be its own card for sure and stand as a simple counterpart to Fire Shield for 5|4
quanta. However, I want to think about this further and gather more feedback if I can before making such a change.
For the purpose of discussion and disclosure, here are some other versions of the card which were discarded:
"When struck by a weapon, this shield swaps your weapon with your opponent's. When your opponent alters your quanta or alters your hand, you heal 2 HP" This shield would have been used to hand your opponent Discord and heal back some of the damage as well as serve as a soft counter to denial. And there are certain situations where being hit by a Discord effect is desirable, like a rainbow wherein you have a very tight budget in a certain element but have quanta to spare in several others.