You included powerful Green slow-down cards like Wall of Blossoms, Spike Feeder, and Spike Weaver with this shell and you could easily bounce four permanents each round with the untapping, and then when you added in Capsize from above
White decks urgently need card draw, which Sram provides in a build like this
Knight-Errant of Eos Knight-Errant of Eos is a 4/4 with convoke for that flips two creatures with mana value less than the number of creatures used to convoke the Knight-Errant out off the top of your library
In theory, this could easily solve the supply problem that Bulk Up is poised to experience
It's pricey on the secondary market, but it's played in a massive 22% of White decks
One is a free Raise Dead spell that costs no mana and can return something awesome, and the other a strong Assassin effect for two madness mana