In the right matches, this is going to allow you to play your entire hand on that turn, and thats very hard to argue with
She has three lore, she can exert characters at a whim to make them easier to challenge, and she prevents your opponent from exerting characters to sing songs which is literally one of the strongest (if not the strongest) mechanics in the game
If an effect puts this land onto the battlefield tapped, you may pay 2 life, but it still enters tapped
Similarly, creating tokens with defensive abilities, such as reach or vigilance, is stronger than creating ones with offensive abilites, like haste or trample
However, the important thing to note about Narcomoeba triggering is that triggered abilities don't go on the stack when they trigger
An already strong offensive Pokmon that can instantly buff your whole team and help you win the game twice as fast, it's hardly surprising this card became so popular for so long