For the chart to work you must first ask yourself two serious questions
Sure, 10 mana is a lot to be paying outside of EDH, but 10 mana for 20 power will always be worth it, especially when those tokens are knight-type and get the bonuses from the rest of your knight lords
By adding a way to keep Shalai safe, like Lightning Greaves, you can have a board that only falls to board wipes and there are plenty of tools to stop those, too, from Teferis Protection to Avacyn, Angel of Hope
Brimaz proliferates once at the end of your turn, like Atraxa, but needs a Phyrexian to have died under your control first
By copying Magda, not only do you have an extra Dwarf to attack with, but every attacking Dwarf generates two Treasures instead of one