@Phantasm.Angel

Which crobat line? If you've got it (this may be a longshot) go for the Plasma Storm ones! Night Sight ability gives you some draw support, no retreat cost- and it's Ultra Toxic Fang makes 4x poison damage than normal for three energy (two with the stadium)- downside is that it needs a psychic energy and would break your colorless streak. Blend energies work well though~ (I think one of the blends has fire and psychic)
@MC Elesa

I've got a shortage of steel types overall- so I use what I can. Dialga fits pretty well, though it does take a bit to setup- and I don't mind the anti-EX attack. xD I've also got Plasma Dialga- but that requires other energy types, if I recall.

I don't mind the vulnerability to enhance hammer- I haven't seen it all that much lately (maybe I'm just lucky) and I tend to have more energy in my deck than most would- so I'm rarely in an energy crisis. The original intent of my metal deck was to have Excadrill use dredge twice in one turn to get all that shielding right away- which I still do if I have Excadrill setup early. It works pretty well since I equip the energy far faster than they can hammer it away. Mix with a silver bangle or muscle band and Excadrill deals a hefty amount of damage while still being sorta-defensive (without the shield energy, he goes down pretty quickly).

I have more normal metal energy than your deck does. I swear! xD

Aegislash and Excadrill are the main cards in my steel deck- I'm still working on the right balance to make sure I can setup quickly enough, but it's getting there. xD