To get that life total down below the '13' threshold, you have a bunch of cards that have an additional way to lose life
Nested Shambler might only make one Green Squirrel creature token when it dies, but if I were to play Yavimaya, Cradle of Growth to make all my lands Forests and enchant that Zombie with Blanchwood Armor to give it +1/+1 for each Forest I control, I could be looking at an awful lot of Squirrels
Triceraton Commander Triceraton Commander is a fine mana sink for decks interested in a big, epic threat
These came as different Retro Frame Zombies from throughout Magics history
If your word is true and you show fierce dedication to one of the courts, the entire realm will be your oyster
Typically, in a format like Standard, how creative you can get and how many colors you can play is going to be defined by how good these dual and other nonbasic lands are going to be