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If youre trying to emulate the feel of retail Limited, you can calculate the ASFAN of fixing lands in that set and extrapolate to your given cube size

There are a lot of cool cards and some new mechanics, but to my mind, the coolest new cards for our Commander toolbox are the new enchantment subtype, Backgrounds

And its not indestructible

The new order of rarities: Common Uncommon Rare Super Rare Legendary Epic Enchanted Iconic The collation of epic and iconic rares hasnt been revealed

She couldnt focus on what, and honestly didnt much care

So, new things that come out for Magic should be able to be integrated into Arena with some ease