The idea is to stall. The play you’ll hopefully get is origin, Thanatos at a zone origin points to, and torrential tribute. If that happens then Thanatos makes itself immune and you can activate torrential tribute, Thanatos will protect itself and origin will do so too bacause it points at a monster, then origin’s second effect goes off and spams a bunch of monsters from the deck.
Origin is a cool card with a really powerful effect but getting it out is a hassle, and this deck probably isn’t that good.