You can sometimes "splash" a third, playing two colors as your base and a couple powerful cards or additional costs of another color, but I'd really focus on the two colors you want here
Energy Capsule wouldnt help in this scenario as the Charizard player can simply Lost Vacuum it away, putting Roaring Moon back at 30 HP
You get 100 of them, along with 100 perfect-fit sleeves and a deck box for only $10.50
The thought process was that ally colors should be easier to play as it matched the flavor of the color pie
Me, Id still run all copies of Nazgl that I can put in the deck, because honestly, when are you ever going to have all nine of them along with Witch-king on the battlefield
Admittedly, in my experience, those from the Battle Academy tend to be trickier to pit against others successfully, but the recent decks are slightly better for this