Otherwise you start the infinite loop that ends in their defeat when you hit combat damage with the Starscape Cleric, or my personal favorite, put a dirt cheap dual land, Scoured Barrens or Forlorn Flats into play
Your Rats can provide the crew costs to send off your fleet each combat
Both are worth playing in decks that support them as ways to cheat high mana costs on exceptional threats like Bolas's Citadel and Atraxa, Grand Unifier
The deck also features 4 copies of Dragon's Fire to help with opponents' early game threats
No duds, no filler every SIR has genuine artistic merit and collector appeal
Before you ever consider common or uncommon specs, consider your options in mythics, and then rares where you can cycle fewer sales for bigger profits per sale, reducing your time spent per transaction and lowering your incidental transaction costs such as shipping and materials