This deck uses Prescience to reliably draw the powerful Titans Golganneth, the Thunderer and Yogg-Saron, Unleashed, and it uses Cold Storage to play more copies of them.
(Don't forget to use their ability before freezing them, as their abilities are unusable while frozen!)
If that gameplan isn't enough, the backup plan is to do nature shaman stuff. I most often pick Ring of Tides from Queen Azshara to use as a bonus copy of Bioluminescence, but other options are okay given different circumstances.
Is it good?
I mean, you're playing nature shaman but with more Golganneths and a Yogg. It's good.