You couldn't ask your opponent to do it for you either unlike something like flipping a coin or rolling a dice, as they can rig it so it won't land on their creatures
Box lots (i.e., books) are only guaranteed to have those items listed in the description, and no condition reports or additional photographs will be provided
About five years ago, those types of cards were much better since cubes were slower, but with many cubes adopting aggressive strategies and getting more efficient removal options, things like the Vindicate test (where you get an effect out of it if the creature dies at sorcery speed, so Consecrated Sphinx passes that test) hamper its effectiveness, but it does protect itself well if you are able to untap with it since you can turn just about any blue card into a counterspell or draw card
Youve got the right colors to use both Xavier Sal and Glissa Sunslayer
The effect that allows you to play an additional land that turn is cumulative with other effects that do so, including itself