Linvala 2.0 is far from being a bad creature, however. For 6 mana, a 5/5 flyer with two abilities is okay. She’s sort of Timely Reinforcements on a stick. When she enters the battlefield, if an opponent has more life than you, you gain 5 life. Also, if she enters and an opponent controls more creatures than you, put a 3/3 white Angel creature token with flying onto the battlefield. If both are true, you get both effects.
In a vacuum, Linvala, the Preserver offers good value. But, is that worth a slot in an EDH deck, even at 6 mana? In EDH, life totals are twice that of regular Constructed and a single 3/3 Angel token doesn’t do all that much. Sure, you can abuse her abilities a bit with cards like Conjurer’s Closet, Deadeye Navigator, Eldrazi Displacer, and the like. She’s just a bit underwhelming.
You could try and run an Angel tribal deck with her at the head of it, but there are just so many better options. She’s definitely playable. There are some Kaalia of the Vast decks that play her, for example. Avacyn, Angel of Hope and Archangel Avacyn have also given her a shot from an Angel Tribal perspective. Even Brago, King Eternal has tried to abuse her enter the battlefield abilities. Outside of those who just really want to play her, Linvala, the Preserver is having a hard time finding her way in EDH.