Free spells, improved spells, or something that feels an awful lot like spellcasting. Knowing how game-changing spells can be for any character, I was naturally pretty excited to see the feats list in D&D's next spellcasting-focused sourcebook, Arcana Unleashed. You already need to be able to cast spells to use it, but if you can, it's worth a look. The most interesting thing going on here is that, when you level up, you can swap this feat's spell's. When you cast a Transmutation spell on your turn with a spell slot, you also increase your Speed by five times the value of the spell slot spent.