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This card has already done its job if you get even one land out of it, but its very likely that Deep Gnome Terramancer will stick around and net you multiple lands if there are green decks or color-intensive decks that might run fetchlands at the table

But in doubt the flashlight test is a pretty good indication of which is which (if you have both of them to compare)

I'm sure there's loads of discussion to be had in the Cardsphere Discord about the pluses and minuses of various models, so pop in if you want more information

It cant be countered, and you dont have to spend any mana

It just gets put into the graveyard directly from the library