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petals are very valid to use, just i like to have more than one use out of them and overall to me a diamond is better than an extra land because it cant get wastelanded.

Regarding my choice of moxen over dynamos. I tried dynamos but ended up liking having earlier metalworkers over anything else. Mox diamond is just another way to t1 metalworker.

for sideboard I...

here is my latest 75. works pretty well so far:

Maindeck


4 Wurmcoil Engine
4 Steel Hellkite
4 Lodestone Golem
4 Metalworker
1 Phyrexian Metamorph