This asymmetrical effect creates massive tempo swings that will often choose the winner of games, especially when cast during opponents end steps
Capturing the growth of a heroic journey and its trials with a gradually increasing mana investment is lovely, and its become the template for interesting creatures like Surge Engine
Healing effects, card draw, and especially removal become immensely impactful choices thanks to Glimmervoid Basin
There have been creature lands like Mutavault and Creeping Tar Pit, lands that replace themselves like Forgotten Cave and Fetid Pools, lands that act like spells like Blighted Fen or Shefet Dunes, lands that act like artifacts like Blast Zone or Desert, as well as lands that act like enchantments in Field of the Dead or The Tabernacle at Pendrell Vale
Theyre still powerful, but not so oppressive as to be a major threat
As we are probably in three colors, that fixing is valuable, and the flying body plus ability to help us improvise is a nice bonus