Playing this on four isnt amazing as it has bad stats and doesnt really do anything all on its own, but Proliferate is a pretty big theme in the set, so youll often be able to take advantage of it and draw a whole lot of cards
Creatures and Artifacts are permanent, but having their abilities vary from one turn to the next may not see intuitive
I see it as a fun deckbuilding challenge to work with a commander that is colorless
Yes, cold water works best with a very gentle clean
At the beginning of your upkeep, if there are four or more land cards in your graveyard and you both own and control Titania, Voice of Gaea and a land named Argoth, Sanctum of Nature, exile them, then meld them into Titania, Gaea Incarnate
From a mechanical perspective, this life loss drawback is reminiscent of black cards like Phyrexian Negator or Plague Spitter, but with a redemptive twist built in