It was, but sometimes, it's fun to state the obvious.
That said, the ability seems a little weak. Unless I'm forgetting something, this is only linked to Pegasus and Wyrm in terms of reliable divers, and even then, you still have to pay out sizable amounts just to get them out. In addition, cards which affect the whole map are best when you have a lot of monsters, and it would cost even more to continually dive enough for this to have a lasting impact.
I feel like doing something with Airborne creatures would fit and would probably give it a more reasonable amount of coverage, but that's just my two cents.