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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

You flip the cards face-down 1-2-3 and

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

That's always my starting point, which is then tweaked to suit the individual deck's strategy and further tweaked with playtesting