This is about 1 turn too fast and the linearity of the burn kill and tallness in pure stats of the white creatures is above the line, yes. Overall though it is good and both addition and subtraction that is upcoming with more playtester time that actually includes the Dominaria cards should make it better. See Play Design timeline.
Private Mod Note
Rollback Post to RevisionRollBack
"Warning: Um, warning. This is going to be a game state violation. And a taking extra turns and drawing extra cards violation, pretty much, a whole bunch of violations. Look at me, I'm the DCI."
RDW stands for Red Deck Wins, which is a specific type of red aggro deck that has existed in some form or another in Magic for a long time. I'm assuming the other two are supposed to be White and Blue? Deck Wins, respectively. I'm assuming B stands for Blue because I haven't seen a monoblack aggro deck do anything in Standard for a while, but if it is supposed to be blue, it's confusing because B stands for Black in Magic, while U represents Blue. Now, aside from that those two decks would be more appropriately called monowhite aggro and monoblue tempo, RDW, as I said is a specific deck archetype.