There arent many stax pieces that are as brutal as Archon of Emeria when played early, especially if your opponents were banking on fetchlands to fix their mana
Well, it depends on which of these mobile card games you're talking about, and in some ways, not much has changed
Tormod is definitely the stronger of the two because black works better with the archetype and zombies have considerably more support that spirits, but you'll realistically play either one in your gravebreak deck, assuming your colors support them
If you cast Petty Theft, exile it instead of putting it into your graveyard as it resolves
Streams EDH, Oathbreaker, D &
The Charizard deck works similarly, requiring Moltres ex to quickly boost energy to its powerful 200-damage dealing move, Crimson Storm