If an effect allows you to put a card with particular characteristics onto the battlefield without instructing you to play or cast it, you consider only the characteristics of a modal double-faced card's front face to see if that card qualifies
Because of Ashaya, Argothian Elder itself counts as a land, letting you untap it and the land you tapped for mana before
"Introducing Achievements on MTG Arena"
(The Buster Sword is confirmed to be in the set, though its abilities have not been revealed.) Iconic villain Sephiroth appears as a double-faced card, Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel
Players often want to find the most powerful or busted card, but Commander is a casual format, so I like to prioritize having fun instead of winning
Getting the full value from this white commanders enters ability requires a losing board state