KDA with Spellweaver is a fairly simple comp to play that feels very natural to progress. You want to start with a KDA/Superfan Opener and usually rush towards Level 8 as fast as possible. Sell your Headliner and look for a good replacement until you find Ahri. With a KDA Opener you usually pref KDA Headliner on Ahri or Akali and go deeper into KDA. If you open with Annie it's possible to end with 5/7 Spellweaver instead.
If you manage to find two KDA Emblems then you should attempt to go for the KDA chase trait with Level 9, because the amount of stats you receive will often result in a free win and it's surprisingly easy to reach.