Mages Can Carry Too! Joust/Arena

I rarely post negative comments, as I rarely post comments at all. But I really couldn't stay away from this one. I feel like I don't need to go over all the obvious red flags in both your build and in your questionable statement below. I have always been a believer in posting builds for yourself and nobody else, but the fact that you "like the recommendations for pen" shows that this build IS intended for others to use.. In which case, what are you doing?? If you say that pen items are good situationally, the LEAST you could do is specify that and list some options. At the end of the day, this is your build and you're free to do whatever you wish with it. But if your goal is to "guide" people to do better, then you are completely off base.

Thanks for all the comments! Keep in mind that this build is for joust, and I expect Discordia poke ability to shut down teams early on with this build. I like the recommendations for pen., but I would only look into that situationally or against a Guardian/Warrior team comp. When playing Discordia you will have some sense of ***n/hunter/warrior and simply make them responsible for shutting down tanks. Discordia can trap and control, and shut down easily any ***n, hunter, or even other mages. I have used this build forever and it has gotten me a Diamond Discordia two seasons in a row. Also chilling in Plat Arena with this build

I'm personally a fan of Rvynn's build direction for Discordia in teamfight modes. This means rushing CDR for ability spamming, since she can poke so well. Chronos' Pendant would do much better earlier in the build.

This build also really lacks penetration. Shoes of the Magi isn't enough. Spear of Desolation can be considered, as can Divine Ruin for anti-heal effect, and Obsidian Shard to counter tanky builds.

Bancroft's Talon isn't a good pick for her. She's not a boxer/bruiser. She's a long-distance poke god.

As such, can't exactly recommend this build.

Can't recommend these builds at all, especially shaman's ring on Discordia and 2nd item at that.

You should add some penetration options like
Obsidian shard
Divine ruin
Spear of desolation

Bancrofts talon is a high risk/medium reward item. If you get injured a lot, you can unleash a pretty strong ult. But I would say just stick with soul gem.