Each land here represents a different location in the Forgotten Realms, namely Waterdeep on plains, the Moonshae Isles on islands, the Underdark on swamps, Neverwinter on mountains, and the jungles of Chult on forests
It's easy to see why 64% of Sam and Frodo decks on EDHREC have already adopted this card
To be fair, there's nothing all that special about lands like Ferrous Lake
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Other reasons Pacifism effects suck are that you can also still sac off the creature for value, bounce and recast it free from its aura, give it protection such that the aura falls off, or simply kill the Pacifism and have a potentially flash haste version of your guy back
This card makes a lot of mana and then can use it for all the colors, much like a super Chromatic Lantern