|This build starts with Mathilda's base kit and budget builds upon it to give her the ability to be able to defeat almost any cavalry unit in the game, hence the title Jouster Mathilda. Due to the specific nature of this build targetting cavalry units, this is an assault build where a player knows that they'll be going up against cavalry units.
Her IVs are listed as Any; however, it would be best if she did not have a -Atk or -Spd bane as it impacts her offenses, increasing the likelihood Mathilda leaves her enemy alive.
Her weapon is her default Ridersbane+. With it, she gains effective damage against all cavalry units.
Her assist is Reposition which allows her to provide mobility to her teammates and move them in and out of enemy range.
Her special is Moonbow thanks to its quick charge and extra punch it gives Mathilda's damage when it procs. Iceberg is her secondary choice as, while it does provide more damage thanks to her high Res, its longer charge time does mean in some scenarios she misses out on a few KOs if it's not charged (eg. Frederick). However, with a charged Iceberg, even against non-cavalry unit she can very easily become a threat.
She can take Fury 3 to gain some bulk and also potentially sponge hits on enemy phase, but depending on her IVs, she can potentially miss out on some KOs without the doubles (eg. Neutral Fury Mathilda vs. Camus and +Spd Variations of Cecilia). Even with this bulk though, she fails to tank QP+Moonbow Reinhardt and Lyn (Brave Heroes), so she needs to be wary of these units and get the jump on them first.
For her B passive, we keep her default Cancel Affinity 3 as the budget option, and also because this allows her to handle Emerald Axe+ cavalry units such as the popular Titania.
Her C passive is flexible here depending on her team. If she's on a cavalry team, she can take a cavalry buff, otherwise another buff that her team needs is sufficient.
Finally, for her sacred seal, she can either opt for a little more speed with Speed +1 to try to get more doubles in, or beef up her Atk a little more with the Attack +1 seal.