Nostalgia-check, mechanically tested, mother-approved, and Slivers make it back into Magic at the very core
Support for morph, disguise, and trick-based mechanics
The Tempest block was released in 1997, so lets keep in mind that these creatures have suffered from serious power creep
The big change in Gatecrash was coming up with the idea that the haste was connected with "attack each combat if able." That managed to give the card a little different spin and finally make it all the way to print
In the ideal scenarios, you are getting a three-for-one
I prioritize powerful five-drop and six-drop characters, but I also value cheaper characters with great stats, evasive and/or potential for card advantage