you put a -1 -1 counter on the druid to untap her, not pay 1 mana to do it.
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If you go with thraximundar then you would want to have a lot of sack creatures. Sengir Nosferatu is a good one and you can keep doing it. Breeding put with archdemon of unx is a good sack combo as well as skeletal vampire.
You Need 100 cards for an edh deck. Im guessing the Thraximundar is your general? Debtors Knell and Call to the grave would be good additions as well as gravepact is always good. You can only have one card of each in your deck (minus land) so you cannot have the 3 lightning bolts or the 2 essence scatters. Not bad so far.
replace coat of arms with sliver legion
immaculate magistrate + joraga