I am not sure Flayer of the Hatebound triggers off Gyrus. Gyrus exiles the creature and creates a new token. Nothing is entering the battlefield from the graveyard.
I would not expect to get more than a couple activations off of pod (in my meta). Unless your playgroup is removal light, it should get removed quite quickly. It is a massive value engine and will not go unnoticed at a competent table. I would not build my entire creature base around abusing it when you are likely to have it removed. As long as you have a good creature curve, you should not be lacking targets, and will always get value.
Do not play too many high CMC silver bullets just to make a pod chain. They will get stuck in your hand if you pack too many.
Brutalizer Exarch and Rune-Scarred Demon are both high costed and can be had lower on the curve. Also Rune-Scarred Demon is a blue players toy if they hit any copy effects. At least Sidisi, Undead Vizier required a sacrifice to tutor, so no crazy clone chains can happen. Greenwarden of Murasa is also high on the curve even if it returns two cards. At 6 cmc you will likely want to affect the board a little more unless you are heavy on the mass removal.
I like Woodland Bellower at 6 for the toolbox and Inferno Titan for Haste with Gyrus (except it looks like you don't get double burn triggers). Protean Hulk will always do broken things, if you want to try it out.