Well the orb you wanna go for is not gonna work out well, when you get Lost Souls map. combining Battleship and Construct makes the deck possible to play in any situation. ( consider that even with Battleship you still heavily relay on Frenetic assault in Lost Souls maps and recharging the card with offering is needed.)
Battleship is fine against flying units and it helps finishing off low units and not wasting powerful Construct shots for them. however other than Lost Souls map you don't really need more than 4 Battleships in your army I thinks it's a necessary card for the deck theme-wi