I cast hazoret's undying fury and the first card i get is verdurous gearhulk and then the next one is fling (two irrelevant cards after that). Let's say i cast both without paying their mana costs. Can I fling verdurous gearhulk for 8, 4, or not at all?
I'm not a judge, and many others on this site have more experience, but lemme attack this with kitchen table logic:
Assuming you want to do it all with free spells from
Hazoret's Undying Fury, you have to cast all the spells for
Hazoret's Undying Fury before you can move on to something else. So you pick your spells, they go on and come off the stack in order.
Here is the reason i think it will not work: if you cast the gearhulk first, it goes on the stack, then
fling. Gearhulk hasn't resolved when you pay
fling's additional casting cost of sacrificing, and you wanna sac the gearhulk. If you cast
fling first then gearhulk, gearhulk will not even been cast when you need to pay the additional cost of saccing the gearhulk.
That's the way I read it, if I read your question right. Maybe
Hazoret's Undying Fury allows you to cast your first spell, let it resolve, then cast additional spells with the effect from the red sorcery.