(And, while we won't be getting into the intricacies of sideboarding in a new format today, you're also allowed a ten-card sideboard.) Now that the rules out of the way, here are some general things to consider about the format: The format is fast and powerful
Ashnod the Uncaring Ashnod the Uncaring is a powerful Grixis commander that cares about sacrifice outlets, effectively doubling the benefit they provide with a given activation
Id want to make Tahngarth tougher to kill, so Darksteel Plate is a fine choice
I guess you can keep waiting, but the Allies hype is already dying down, so there's a very realistic possibility that you'll have to bite the bullet and take a loss even though the card shot up 400 percent overnight
Community While we've increased our communications, we still have some work to do on frequency, timing, and accuracy
During your end step, by sacrificing a creature you can deal damage equal to its power to any target while creating three Treasure tokens