Concepts like signaling and counterdrafting are deep and complex, but the fundamentals are relatively easy
Part Water depicts a mage taking a page from the book of Exodus, and parting the waters, enabling a caravan of Israelites and/or your creatures to pass through unhindered by Pharaohs chariots
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
Turning graveyard entries into token copies is absurdly potent in most reanimation shells
If cloak is happening via an ability (say, from Ransom Note), then yes
Here is a link to that earlier post (December 25, 2012)