There's no point in building an exceptional deck that takes time to attack if the players profile is better suited to fast decks
It also gives you some incentive to keep Grimer around until a big Pokmon shows up, but this might cause Muk to come in with less health than is normally ideal
It went exclusively to World Championship finalists with zero retail release
This land is also essential for Esper control decks
Other cards that help get essential cards on the field are Pok Ball for finding basic Pokmon, Professor's Research for drawing cards, and X Speed for switching out what is in your active spot
The natural scarcity of the Aquapolis set, combined with its age, has made it a very desirable set in the modern age of Pokmon TCG collecting, and just like most releases from that decade, it's considered one of the holy grails in the collectibles space at the moment