The cards have promo numbers 18 to 23 from Promo Set 1 (P1)
Marrow-Gnawer's effect to generate more Rats for practically free makes all your Rat Colony copies on the battlefield giant, albeit still with one toughness
I would change the Steam Roller package to focus more on Thassas Oracle based win-conditions
Typically I am looking for consistency in my cheap filler artifacts and so playing ones that further require build attention to are a bit of a turn off
(use CTRL+F to look for what you're interested in) $0.50 each or up to 3 free with a purchase of one of the holos/rares : Gligar x2 (different arts), Voltorb, Electrode, Dunsparce, Spearow, Binacle, Dragonair, Special Energy (Double Dragon Energy), Shroomish, Tangela, Bidoof, Clamperl, Meditite, Whiscash, Dive Ball, Bagon, Electrike, Taillow, Wurmple, Fletchling, Shelgon, Ninjask, Ultra Ball, Krabby, Deino, Dedenne, Alomomola, Enhanced Hammer, Boldore, Tierno (Prices in USD) Rares/Holo's: Jamming Net - $2 Helioptile - $1.50 Absol - $2.50 Tentacool - $0.75 Gorebyss - $1.00 Marshtop - $1.00 Shedinja - $1.00 Gligar - $0.50 Given sales permission by allinia, 3/24/14
If you are stuck at two however that third land is really important
