Your creatures are still somewhat more vulnerable out of combat, but no more so than they would have been without Unnatural Growth
So while you may not have much use for black mana in a mono-blue deck, you can still generate and float any color of mana with cards like Mana Confluence
Creature - Insect Color tag templates(None) Giant Scorpion Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) Creature - Scorpion Color tag templates(None) Gleancrawler ( can be paid with either or .) Trample At the beginning of your end step, return to your hand all creature cards in your graveyard that were put there from the battlefield this turn
(Oh, and this requested list includes any exclusive trainers as well, banned, etc.) I might have them all figured by now, but I have no way of knowing for certain, so I need help here from my fellow JP collectors)
Ive had situations where I needed to topdeck a fifth mana source to cast Through the Breach but drew a Copperline Gorge
While you can name Relic of Progenitus or Nihil Spellbomb, I dont recommend siding Needle in the blind versus decks that dont have other relevant cards to name