Myr Matrix would allow you to channel the infinite mana combination provided by Myr Galvanizer and the mana producing myrs into infinite tokens.
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I think the land that people are trying to describe is Wirewood Lodge. Lets you untap target elf.
Its definitely worth considering Gravecrawler for this deck. Maybe in place of the Zombie Infestation?
Have you thought about taking out a couple of Havengul Runebinder for a couple of Havengul Lich? Opportunity could come up to steal people's creatures from their graveyards.
Have you considered Grimgrin to work with the Gravecrawlers? It allows you to get a massive guy within a few turns that destroys creatures.