You'll also note that the Death's Shadow list is only playing 17 lands, which is on the extreme low end for "normal" decks
Ondu Inversion Ondu Skyruins is a nothing-card, and Ondu Inversion is a full 2 mana more expensive that Planar Cleansing which already isn't very exciting, so why play this card at all
While the Mightstone and Weakstone can't live with Urza within the Command Zone, Azorius (blue/white) has access to great card drawing and artifact-tutoring effects that can allow you to reliably access this card
Whenever a creature you control that's enchanted or equipped attacks, create a Junk token
The three classic mistakes (and how to not do them) 1) Tiny text If you have to pick it up to read it, it is too small
So, while you may want to put Archon of Cruelty into your graveyard to cheaply reanimate, you may instead get a Sakura-Tribe Elder that youve got in the deck to help you ramp