maybe play selfless spirit over rattlechains, since geist already has hexproof and selfless spirit protects your whole team also in combat situations (which might be relevant for the small 2/2 geist body)

You make a great point. The main reason I play Rattlechains is actually to give Geist of Saint Traft flash, but I think that Selfless Spirit will be more impactful. Thanks!

I think your spirits deck lacks a sufficient number of spirits. The thing that spirits are good at is the tempo game: disrupting your opponent while putting threats onto the board. But when your deck only plays 13 creatures you're not going to be applying as much pressure as you want to, and so you aren't using the tribe to its full potential.

Cut down on some spells and also that Elspeth, Knight-Errant to fit in more creatures. Also, go down at least one Geist of Saint Traft and a Selfless Spirit. Geist is very hard to deal with on its own and you don't want to draw multiples since it becomes dead in hand, and while Selfless Spirit is very good at protecting your board, you don't have enough creatures to bother protecting, and it isn't much of a threat in itself. Most lists I see (even ones with a high density of creatures) play 3.

Mausoleum Wanderer is a very nice spirit to have since it forces your opponent to play noncreature spells off-curve to play around it, play 4. Topplegeist is another one-drop you could play if you felt like it. You can put some Rattlechains back in since the flash that it gives your spirits is actually very relevant, and Drogskol Captain is a great spirit lord, made even better with flash.