I haven't played in forever and I have these in my wardrobe still -- couldn't find them in shops/trades. Any ideas?

At most 80M for Pyroclastus, Hydra would be around 120M max, and Hiryuu would be around 75M.

Awesome, thank you! Any idea why there don't seem to be any floating around in trades and stuff btw?

They're not expecially in demand, so people are just holding onto them. I have a Spectre in trades and no interested party RN.

You unfortunately just can't trust shop search and trades to tell you the exact value of something. [Item=5 Point Wizard Token] has none in shops in trades right now....is it worth 100m or rare at all? No.

These are all legendary combos and as Sopheroo mentioned....there just isn't much demand. They've been around for a while so most people who want them already have them.

You can also look at the components to help give you a price:

Pyroclastus = which is $36m in shops plus a which is 40m in the millionaire center during the fall or 50m today (cheaper if you buy from someone else). Someone can go out and make these themselves for ~$76m so your going to have to discount it to find a sale.

Take the same approach with the other 2 items.