I just tested this deck online and it works really really well! Yes it depends heavily on Tempered Steel but most of the time the Indomitable Archangel helps out until you draw a Tempered Steel card! Mulligan until you have a TS is the best way though! The Glint Hawk Idol is very good in this deck. You can't counter the ability and it's not a creature you can't exile or destroy with Journey to Nowhere or Day of Judgment when it's not active.
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This deck is nice but I have a lot of mana problems with it! Sometimes I get no plains at all.