Not everyone can afford to own every card, and if you want to pretend something else is an Underground Sea for testing or on your kitchen table, that's great
Players could buy a couple of cards here, a couple there, and maybe even benefit from some of the price increases if they bought into the right deck early
Whenever it deals combat damage to an opponent that has more lands than you, it can bounce itself back to your hand and search you up a Plains to put onto the battlefield tapped
For a while the leading contender was, believe it or not, Form of Uncle Istvan, but in the end we were worried not enough people knew who Uncle Istvan was
Don't worry about being exact When you are looking though a binder of 500 rares, being able to estimate quickly is important
Also, Quilled Greatwurm would probably get some form of protection