Dressing apprentices to look like Myark and put them on flammable rafts, and tell them to say "OH, WHAT A SHAME IT'D BE IF AN ENEMY USED MAGIC ON ME!" repeatedly as the rafts start to float near enemy boats. For results on land, make the person hold a torch, a shield, and stand at roughly medium to long range from enemy ranged troops.
...Actually, decoys (that don't use our mages/troops) wouldn't be a horrible idea. Maybe we could make a design in the future for "mist form" - using mist to replicate the look of a human being? Would help in skirmish and in distracting enemy units at all stages - ranged, melee, routing, and more.
And Ebbor, the idea behind the extra range is twofold:
1.) Future-proofing: Doing it now in a design means that all we have to do in the future to actually improve range is make a sighting spell/communication method. This is the main focus. Otherwise, we have to spend at least 2 revisions or a design and a revision to increase range.
2.) Fortified Positions: Enemy castles, towns, harbors, and to a lesser degree, artillery emplacements, can all be shelled at extreme-long range since they don't tend to move and their positions could conceivably be communicated to the artillery before something about that target changes. If they have a castle, town, or harbor, all we need to do is note the position once, then begin shelling at super-extreme ranges.
The range isn't the actual priority, but given the difficulty of everything else I think it's overall beneficial to do so. It's not a huge deal, but I still want Arstotzka to be the first to have reliable super-extreme range and not have to focus more actions on doing it when we can just do it now.
And just to be clear, the only different between Metal Storm and Onslaught is that Onslaught has a planned longer range, right?
-----
Andrea does have a point, though.
I think the biggest priority is holding the mountains and advancing at sea. If we can make a design that accomplishes that, a new artillery design can be delayed to next round and be much easier with the metal back. I guess we could do the SO1-AM or SO1-AD variants now? The problem there though is that they don't really help at sea, but we could use our revision to make our boats lighter/armored/etc.