S3 Discardweisse - Diana

You ideally want to keep 2 Heart Shakers in the deck to keep discarding and drawing them; 1 Heart Bullet is also a valid target but less effective than an Heart Shaker.

If there's nothing worth discarding and the hand is too full, prioritize discarding Sword Resonance and/or Eternal Hunger

Ideally want to play Pistol of Purification as late as possible to take advantage of Resonance, but it's fine to discard early.

It's possible to play Light and Dark cards for free DMG at the end of the rotation, they will also regain Retrieve if you merge them.

Take note that Diana isn't spamming Quietus or Attack cards, so buffs to those 2 types won't work. Resonance gets buffed by generic damage buffs (e.g Morale) and counts as Extra Attack.