Mudora gains 200 ATK for each Fairy type monster in your graveyard, so the point is to try to get some Fairy monsters in the graveyard to buff Mudora and beat over some cards. Alternate options include summoning Vanity's Ruler to prevent special summons, or Guardian Angel Joan as a beat stick that can give you some extra life points in the process.
The Agent of Creation - Venus could be inserted into this deck to special summon three copies of Mystical Shine Ball and use those for Xyz summons. Detach them and get them in the GY while also getting to use the Xyz monster's effect(s).
Dark Hole could be used to get rid of your opponent's monsters while also getting more Fairies in the GY. Tuners and Synchros could also be a good way to get Fairies in the GY. Other cards like Exchange of the Spirit could be used to both get Fairies in the GY and mess with your opponent's GY/Deck strategies.
There are plenty of Fairy-type monsters and support cards that could work well, so try Mudora out with different Fairies as a fun gimmick.