An attack strength of three isnt exactly unique
You may cast it without paying its mana cost if that spell's mana value is 8 or less
Beyond the Power Nine, cards like Sinkhole, Mind Twist, and Channel are ludicrously powerful spells that were printed alongside things like Burrowing
Some abilities are just sign-posted to be linked with other cards in the set, like with the aforementioned Jim Hawkins, Space Traveler card, and this card is almost definitely built exclusively to get yourself a free Lucky Dime, the seven cost item that no doubt plenty of decks will be building around this set
tokens once they complete the fourth Color Challenge tutorial level
Then the turn after you played it, use that -3 ability and start the card draw