Think the Marianas Trench kind of darkness and crushing pressure.
Whilst it is 'strictly better' than an Island in some ways - you can get or out of it the turn you play it - getting has a fairly hefty cost attached. (Was originally sacrifice a creature)

I like the card. Obviously you can do what you want, but I'm pretty sure wizards nowadays try to avoid things that are even marginally strictly better than basic lands. It's a shame, but I'd expect to see this paired with a very small drawback (smaller than "pay 1 life" since that's what dual fetchlands pay for functionality which is normally stronger than this), maybe "legendary" (most of wizards' slighty-better lands are legendary, I think?) or "this comes into play tapped unless [very easy condition]" or "when this comes into play, your opponent gets [something small]"

What about "When CARDNAME enters the battlefield, sacrifice it unless you return a creature you control to its owner's hand." That would be a very synergistic drawback.

I think I may mix up the two suggestions and have it ETB tapped unless you return a creature you control to your hand

That makes it potentially more powerful, it seems to me.

If there's a choice where one option is "this arrives untapped and nothing bad happens", and the card can tap for without drawback, then it's better than Island and is never getting printed, ever.

Of course, you're free to break that rule in your own sets. Just be aware that it's a very hard-and-fast rule that you're breaking.

relooking at this with several new sets since I first created it, I think it is fine as curreently worded.