Portal of Exigent Doom

Portal of Exigent Doom is a colorless Commander ramp/stompy-artifacts Eldrazi deck. Its main plan is to generate huge amounts of mana fast with lands like Urza’s Tower/Mine/Power Plant, Eye of Ugin, Eldrazi Temple, Ancient Tomb, plus rocks such as Sol Ring, Mana Vault, Grim Monolith, Thran Dynamo, then slam massive threats like Kozilek, Ulamog, Emrakul, Void Winnower, It That Betrays, and Cityscape Leveler.

Key synergies revolve around artifact mana and utility engines: Forsaken Monument boosts colorless production, Mystic Forge and Sensei’s Divining Top help churn through the deck, and Voltaic Key / Manifold Key / Unwinding Clock / Clock of Omens untap big mana rocks for explosive turns. The deck also has a strong artifact lock/value package with Portal to Phyrexia, Darksteel Forge, Mycosynth Lattice, Karn, the Great Creator, Mirrorworks, Prototype Portal, and Spine of Ish Sah.

It wins