The numbers are jacked up to accommodate attacking 40-point life totals, but translate that over to 1v1 20-life formats like Cube, and Bombardier goes off the deep end
Combined with Exploration or Fastbond, the Horn quickly becomes an engine from which you can draw three, four, five, or more cards a turn, at no cost
Its free real estate
At four mana, he can sit at the top of your mana curve, and if you manage to drop a haste enabler such as Goblin Warchief, you can start doubling your goblins straight away (which then also have haste to attack the turn they enter)
The TCG has been growing steadily since its initial release and following the meta-shifting introductions of Rise of the Floodborn and Into the Inklands, theres a healthy variety of competitive deck options
The rules information for Pithing Needle explicitly notes that you cant name a token unless it shares the name with an actual card