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This video does a fantastic job of breaking down card choices as well as allowing Paulo Prrj Gonalve the opportunity to explain his own deckbuilding philosophy

Archetypal Cards Monsters Valkyrie Sigrun Loading

This card cannot be destroyed by battle if it is in Defense Position

Perhaps the inclusion of Magician of Faith and having an additional out to Thousand Eyes Restrict is why he opted for the 2 and 1

As these changes aren't formally happening until the Dominaria rules update, you'll have to wait until then to see the comprehensive list of what and how old cards will be affected by these changes, and Eli Shiffrin's Dominaria Update Bulletin will cover all of that later