No, you cannot meld with a token that is a copy of a meld component because the token gets exiled in the melding process and would not return to the battlefield
Once Acererak is on the battlefield and battling, your opponents will have the difficult choice of sacrificing creatures if they dont want you to have Zombies
Vivi can only be used be turn and only your turn , so you won't be able to have excess mana to work with on your opponents' turns
Burgeoning Burgeoning is a great early game play
Cards like Ohran Frostfang, Saryth, the Viper's Fang and All-Out Assault dont have deathtouch, but they thrive on giving your creatures deathtouch when you attack
As for the best of the new creatures, O'aka, Traveling Merchant turns your excess counters into carddraw, and Maester Seymour grows creatures of your choice as you grow him