What are the Dark Effigies for? There are no normal monsters. You're probably thinking of Double Coston.
Either way, tribute summoning in general is pretty slow, as are the Crashbugs, and Greed Quasar isn't really worth the effort to summon it. Card Trader lowers your hand advantage, and you don't seem to have any defense for spells and traps that don't target a monster (except for Breaker, but that uses up your Normal Summon for the turn). You should throw in Heavy Storm and some Mystical Space Typhoons. You could also bolster your defenses with Solemn Warning and Fiendish Chain. If all you want is a good deck full of DARK monsters, you should consider narrowing the theme even more, such as to Dark World or Infernity.