I bought a no mythics complete set of Theros. I have never done this before. It was cheaper to buy this then to buy singles, plus I can sell the thoughtseize. There are just too many interesting cards in this set. The only mythics I picked up were the Hydra and Elspeth. I may end up getting a couple of the gods eventually, but at this point I'm not really sold on any of them.
Purphoros, God of the Forge seems interesting and combolicious, but not in a direction I really play red in.
Thasa, God of the Sea seems like a solid enough to run, but boring enough for me not to care.
Heliod and Erebus are just glacially slow to provide any kind of value.
Nylea seems playable, but mostly I'd just rather cast overrun.