Even though Time Vault does very little on its own, the easy combo potential puts it at number five on the best MTG Artifact list
They are more flexible than Treasure Cruise, are awesome in Simic Ramp with Cultivate stuff from Green or Izzet Spellslinger with Treasure makers for things like Guttersnipe or Dimir with Coffers and Urborg or with mono-Blue Nykthos, Shrine to Nyx
That's always my starting point, which is then tweaked to suit the individual deck's strategy and further tweaked with playtesting
However, this is the most common deck shuffling method and you should be able to do it
In addition to producing mana, many druids interact well with creatures, like Beast Whisperer and Bennie Bracks, Zoologist
These cards typically ofer ways to draw more cards, add more punch to your Pokmons attacks, or maybe just help recover from your opponents last attack