When can Aethereal Ward be used to discard a power?

Name

When can Aethereal Ward be used to discard a power?

Details

Adelheim's Aethereal Ward can only be used immediately after an Attack or Power card is drawn. It cannot be used to discard a Power card that is already in play.

Cards

Mages

Adelheim

Nemeses

Other

Aethereal Ward

References

https://boardgamegeek.com/article/25392870#25392870