Start by removing and selling the immortals and sparks. Sell the steal as well (do not sell the eternity). That should give you enough for one dragon, I think.
Add the dragon, remove the nova and play some games until you can afford more dragons. Sell any card you win that isn't rare (not for sale in the bazaar), phase dragon or phase shield.
Add the remaining dragons in as you get them in place of a lightning, the spider and another lightning. I'd say keep the shield. It's good, and you might even want to replace one or two PU with shields as well.