True but with the amount of value people put into using
shock lands and fetch lands for mana fixing nowadays it would be safe to say that deck searching for "better lands" is a self made player mechanic that competitive players use often. Also you could play with
ghost quarter and constantly destroy their lands to the point where if they don't search for any then they're struggling for mana every other turn. Also his effect does not have to be a game winner but rather a deterrent for those who want to use cards like
diabolic tutor and such to look for certain situation based answers. If you think about it, if you kill enough creatures in a single turn then you just might force your opponent to search their deck for something to stop him. If they do then they get hurt and if they can't then they get hit in the face with a flying trampler whose probably a 10/10 if you're using bone
splinter on tokens or on creatures such as
festering goblin to kill other creatures in the process. It may not be the greatest combo in the world but it does leave room for creative deck ideas.