As long as you control Ratcatcher on your upkeep, you can search your library for a Rat, reveal it, and put it into your hand
Beyond that, you have the usual suspects when it comes to making a tight EDH mana base: Theres fetches and shocks and duals, with the surveil lands feeling better than ever in a deck with reanimation spells (though Id play them regardless)
There is a lot of competition when it comes to Zombie-based decks, but Eternal Might is Esper (white/blue/black), an untraditional color trio for Zombies, allowing it to play unique white enchantments for extra boosts
As such, these creatures might be the best now but could easily be toppled by the next sets release
Judith, the Scourge Diva will have some fun with this card, shes always a fan of chaos and carnage, especially at the cost of her own creatures