Boosters have always had 15 cards (well, most of them, anyway) because that's what Richard Garfield chose to do with Alpha , years before designing for Draft was even a thing
Kit Cloudkicker and Jasper, Common Crook are inexpensive characters that can help stall your opponent , while Cubby, Mighty Lost Boy can effectively take down opposing characters of almost any size, provided you have a Location to move him to
Although it has the potential to be game winning or saving I shy away from regularly playing cards that I cannot rely on to do a specific thing
However its adviced to check with the judges
But aside from being a hunk of burning Goblin love, this guy will keep pumping out Goblins every turn your commander is in play , and you can sacrifice them to deal one damage to anything