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
This was the beginning of tokens playing a much larger role in the structural design of sets
A mana dork that adds two and lets you cast from the yard is great, and menace is even better for triggering treasure generation from attacking or dealing damage
Simply put, when ranking MTG blue spells by pure momentum swing, this is one of the best blue cards MTG players can rely on for its ability to ramp while interacting
The important things it will teach you, however, are where your cards go, when they go in those places, what order a game goes in, etc