Tapping the card allows it to become a copy of another land card, except it will retain its ability
Chandra, Torch of Defiance, Nahiri, the Harbinger, Narset of the Ancient Way, The Wanderer, Gideon Jura, Vronos, Masked Inquisitor, Path to Exile, Swords to Plowshares, Guff Rewrites History 9 targeted removal
These can be seen through the lens of whites small creatures seeking unity with blues knowledge making them stronger
Not to mention its green identity means it's falling into the best color for ramp, so that high mana cost will likely not even matter after turn three
You can then turn around and cast You Came Back, ready Mufasa, play a few card, go questing again, and get keep playing cards
In the unusual case where Scouring Swarm becomes a copy of something else while its triggered ability is on the stack but before it resolves and seven or more land cards are in your graveyard when the ability resolves, the token will enter as a copy of whatever Scouring Swarm is copying