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#8 Yah, I have a similar idea to your corners idea Korombos

The best way I've found to test your deck is to just play

Embrace the beauty of darkness with ten more Eternal Night Full-Art Basic Lands and a creepy collection of Eternal Night legendary cards

Even if you dont ever actually build that new commander, or help a friend build it, youll at least have gotten a bit of sneaky mental preparation in for when you inevitably spot it across the table from you

If you want to physically play this planar deck for yourself at your commander night, feel free to copy & paste what I have created and proxy up your own monster of a planar deck

However, I dont think its feasible in modern gaming