Yogg change sucks. Chaotic Tendrils already cover the ‘cast random spells’ part of the flavour, now you’re just double dipping and potentially screwing yourself over. Spell spamming is an integral part of Yogg’s vibe, and shouldn’t be cut. If you don’t want the cost reduction, maybe Yogg could do something whenever you cast a spell while it’s in play?
The Jailer nerf also kills it completely, but then it’s a silly card so idk how to avoid it either being ridiculous or useless.