This is a bit hard to answer, as there are so many possibilities. It would depend on the cards you have available, whether the deck would be for legacy or standard format events, and what objectives you're trying to reach (if applicable).
I tend to use her most for events that have a Summon X or less creatures, or Take X or less damage. She has several ways to add creatures that don't count as being "summoned" (i.e. cast from hand), and lots of options for keeping the enemy board clear. I'll try to provide some general ideas later today, after giving it some thought.
I stumbled across a horrifying Kiora deck on the Holiday node that completely crushed my Arlinn aggro deck. I'm not sure if I got all the cards correct, but it's all about turning the entire field to green gems and refilling your hand back to max and repeating the cycle.
Creatures:
Spells:
Supports: