Sphinx decks are, IMO, slow and not worth it. Yes, getting out Theinin is a great accomplishment, and you'll be able to basically finish off the opponent...but the other two Sphinxes have amazing effects. A 3000 Trampler? A 2500 Shinato? The effects are GREAT on their own; you don't need a 6500 monster out.
One thing that many people overlook is the usefulness of Kaiser Seahorse. Treat this as if it were a BEWD deck...attempting to get out a 3000 attack beatstick...without as much support. The two minor Sphinxes (Andro and Thelia) can be normal summoned with Kaiser. Having 10 stars still means two sacrifices...no more. They CAN be normal summoned, but they also have a Special Summon effect of paying 500 LP while Pyramid of Light is on the field.
I'm only putting two minor sphinxes and one great sphinx in this deck, because Theinin can be retrieved from the deck. This deck will be VERY slow...I warned you.
Monsters - 17(5 Tribute, 12 Non Sacrifice)
Magic/Spells - 17
Traps - 6
