See. You fixed suspend. ;)

Mostly - it can only suspend things that need to tap; so you can't suspend sorceries or enchantments. And you can sacrifice things slumbering this way, they get counted for 'x in play' effects and such.

Still - yup, this works pretty well. Apart from being unable to slumber a sorcery; and stunning or putting an artifact to slep makes little sense - so this is mostly limited to creatures - it does the job and is a sensible simplification.

I was thinking more like Slumbering Dragon

I always think of Elder Land Wurm with these designs, but there is a lot of them. Sometimes the simple ones are great.