How could I create a mimic of a seal using editions, where I can make two seals on one card?

[rough shard]

I was wondering how I could use shaders (via F#) to create a "seal" on a card regardless if it has one or not, I understand that cards cannot support more than one seal (as far as I can tell) and I'm wondering how I could use a shader to mimic a seal. For context, I am trying to make a mod called Dual-Seals which allows players to attach two seals on one card, but I can't use enhancements, it shows under the face of the card, not over it.

oh, thanks

if possible could i get a brief summary on how you accomplished it? im a bit new to modding so yea.

the visuals, i will figure out the mechanics at some point