Vehicles and mana rocks are some of the cleanest ways to get Colossus down for cheap, though its effectiveness depends on the format
What are the Options
With her as the leader in colorless and White that's everything from Karmic Guide and Sun Titan to Solemn Simulacrum and Rambunctious Mutt, just in dorks alone, plus Ichor Wellspring, Spine of Ish-Sah in artifacts, Flight of Fancy in auras, etc
Many of these cards are quite sought after due to their rarity and the iconography of the Godzilla franchise
Well highlight treatments a bit further on, but heres another look at the Abzan spirit dragon: The Jeskai (Blue/Red/White) A Dragon with a goal of unity for Tarkir, Shiko, Paragon of the Way, is the leading Spirit Dragon for the Jeskai clan
Cascade seems like the perfect approach to populate a Commander deck built around The Twelfth Doctor, and Throes of Chaos seems like the perfect cascade card, along with Aurora Phoenix, Etherium-Horn Sorcerer, and Flamekin Herald