Rulings are collected from many sources. See credits and disclaimer at the end of the file for details. Three Kingdoms, Starter, and Starter 2000 cards do not yet have official Oracle card texts, so rulings on them are based on Oracle texts made by NetReps.
Complete text is included for cards from all expansions.
These rulings are updated monthly. For example, it will not change Mercenary Informer to be able to pull a different creature type. The Oracle text doesn't say this, but that is an error in Oracle that will be corrected. If you have a positive life total or are otherwise prevented from losing due to a zero life total, this triggered ability will cause you to lose the game anyway. While this work is not officially issued by Wizards of the Coast, it is the official collected rulings from official sanctioned representatives of and publications by Wizards of the Coast.