According to Wikipedia, the simple definition presented is that a live service game represents providing video games or game content on a continuing revenue model. Think of it like when non-game programs, like the Microsoft Office or Adobe Creative suites, offer constant and consistent updates to change or enhance various features within their applications
Creative Energy thrives off the mechanic through powerful payoffs in the MTG colors Blue, Red, and White
Four mana for a punisher effect that dissuades attacks
Elvish Mystic AND Fyndhorn Elves AND Llanowar Elves with a Shout Out to Arbor Elf Ah yes
Honorable Mentions There are many other cards we coud have added up close to the bottom $300 range for this list, and we would have been long
If there is a copyright of 95,96,98,99 at the bottom of your card and there is no shadow at the edge of the picture, then you have a rare shadowless card