Griselbrand is banned
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you could splash red for domri race since its a creature deck.
I won't be able to afford any Snapcaster Mages at the moment
Don't add bountiful harvest since trostani is already your healer. Add growing ranks so you can grow your army every turn and it goes well with parallel lives cuz it goes for 2 instead of 1. And add some threat removers like oblivion ring and more selesnya charm. Remove heroes reunion and healer of the pride, then add more wayfaring temple and add the Armada Wurm which gives you also a 5/5 wurm with trample for you to populate.
One suggestion here is Rancor. This deck kinda lacks trample and your wayfaring temple won't be able to give you tokens that frequently.