Infinitely Offensive Defenders

As of late I have been pretty intrigued by the combination of things that can happen with defenders. The following deck allows for infinite mana and damage by turn 4, along with the potential of being able to draw your entire deck.
The deck is dependent on Umbral Mantle being able to be placed as early as possible. As such I splashed in white for Steelshaper's gift.

Putting in redundant means of inifinite mana and damge, I hope results in my being able hit the combo sooner and more regularly.

Please let me know what you think, and any suggestions you may have.

List of changes: old ==> new
curiosity==>Keen Sense
Fabricate==> Steelshaper's gift
Bird of Paradise==>Traproot Kami
Tezzeret==> Asceticism

I took out tezzeret in favor of Asceticism to grant my creatures some defenses.

With how dependent upon the mana generation of overgrown battlement and axebane guardian the combo is, I have chose to replace bird of paradise with traproot kami, which will grant a better scaling with other defenders.

The following the quickest version of getting infinite mana and damage that I could find. If you can do so quicker please let me know!

It also requires you to hit the jackpot on your draw :/

T1: Forest: traproot kami
T2: Forest: overgrown battlement
T3: Mountain: Overgrown battlement. Lobber crew
T4:Forest: umbral mantle (you now have infinite mana as you can equip overgrownbattlement who will tap for 4 mana)
Tap/untap your guardian enough times to generate enough mana untap your lobber, then untap the guardian again ( you have at least 6 mana sitting in your mana pool before you untap the lobber)

• Infinite Combo
• Defender
• Modern
• RUG