In this case, Terravore becomes larger the more lands that are there
If cards are removed from your graveyard after that point, such as by exiling Jack-o'-Lantern from your graveyard to pay for its mana ability, this won't affect whether you can legally cast Graveyard Shift, even if that reduces the number of mana values in your graveyard to below five
Transforming Dion, Bahamut's Dominant, as well as the other Final Fantasy XVI characters, seems rather difficult to do
Similarly, if they sacrifice a Strip Mine to destroy your land, then you put it back onto the battlefield
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On top of it all, theyre a way to keep cards balanced, spreading value and utility across each stage of having the card in play