The biggest hurdle is that its extremely slow and durdly, but proliferate effects and extra turn spells help you to catch up
If its not on the battlefield when the second card is drawn, the ability cant trigger at all that turn
Lets get one thing straight: Atraxa is a good commander
Now, you can only do that lost part with Instants obviously, so bouncing nonland permanents is probably where youre going to go most of the time
Justice Strike can only outright kill creatures with a power equal to or greater than its toughness, of where there are plenty in Guilds of Ravnica
These sets have some of the best cards from recent years, and with stock issues affecting newer releases, picking up a reprint might be the smartest move of the year