Handing your opponents a loaded, Salamander-shaped gun each turn is an excellent way to make an ally, and to set the sights of those guns on your foes
Without it, your opponent could chump block your massive attacker with a 1/1 token to prevent the trigger
And doubling energy production each time is just a massive value, even if you arent using it to more easily go infinite
Are you sad that Johnny has this great permanent out and you don't
It swells with counters, and can combine to shoot stuff, and it has flying as well
Because all of the Meteorites and Treasure tokens you make will double their generated mana, Roxanne is perfect for quickly playing massive creatures like Ulamog, the Ceaseless Hunger or Etali, Primal Conqueror