Getting Moana on a location with another character and a Vault Door in play can deliver a huge pay-off, but if you're letting the opponent run away with the game while you try to set up all of those pieces, it just isn't worth it
Legality depends on the tournament format -- Shadow, Mysterious Assassin Art Series can be legal in some formats and banned or restricted in others
Basic Pokmon Energies as Lands You're limited to one per turn, a necessary resource to use your cards, and no deckbuilding restrictions
Some of them are more hassle than they are worth due to their slow service skills
And some, like Solemn Simulacrum, do both
The tree to the left works perfectly to ground and give the piece some perspective and connection