One issue we'd have with sleeve draw simply giving 3 seals is that we'd use much less minor divination.
With divination on a 2min cd that's only 1 card every 4 that would turn into a minor.

It Buggs me a little because it makes the skill almost pointless.

Another issue I see is the that this would basically kill the skill in itself.

They might as well remove it and simply grant us 3 seal out of combat and make us retain our seals upon death.

Anyway we'll see soon enough.