Rakdos Cackler will be very helpful here. You want to hit hard and fast with a mana curve around 2. The big creatures you are running will just slow you down. Use red for your small fast creature, and then green for combat tricks. Also add bloodrush, like rubblebelt maaka to get damage through quickly
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If it wasn't a standard deck I definitely would, the white lets me have the control to combat the heavy esper and agro you see in standard
In my build which you saw, it is now a back up, but it is an auto win. It will be super helpful vs the mill decks that are going to exist that will just prolong until they mill you out, or get Jace and the duskmantle guildmage out.
I think two rhox over the bloodthrone vampire's would be much better, a big boost to life gain, and a decently big blocker that has life link