Heavy Metal / UB indestructible artifacts (Modern)

This is another try to cheat the blightsteel colossus in. I am doing it by using master transmuter and Karn, the great creator or Tezzeret, Agent of Bolas.
How to play this:
In the early turns you have to use a bulky thing like vantress gargoyle as blocker and/or potential thread. Destroy early creatures and counter some spells. In the midgame you may already have some phylactery lich out there to keep your opponent busy. Darksteel citadel is an ideal target for the phylactery counter you have to place somewhere. If things work well you can play planeswalkers and search for the blightsteel colossus. Get him into play using master transmuter and use the lightning greaves for the swing.
I tried to keep this as flexible as possible, as the planeswalkers can help you in many ways beside searching for the colossus.
Sideboard choices:
Cry of the carnarium is a must agains any wheenie and token army as your bulky early creatures can't protect you against mass tokens. Grafdigger's cage is very useful against dredge and graveyard play. Against planeswalkers, the sorcerous spyglass is really great. And keep in mind it is an artifact that can become a creature by Karn, the great creator and Tezzeret, agent of bolas.