Feln is actually looking pretty nice at time of writing since Shadow has some fantastic removal options, Tenacious Heron is crazy good, and Champion of Cunning and Fallen Winter are solid finishers. Dreamsnatcher and Lipa, Witch of the Woods are a bit spicy but give solid early board presence. Reusable Femur is a necessary evil with Heron everywhere ATM but would be the first swap suggestion for one of the sideboard cards.
No market since it's too much of a tempo loss. If you really want to add one, I'd suggest a shadow market for One Eye Returned and Dizo's Office.
The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.