The only expensive Adventure card financially, Brazen Borrower is a little worse in Commander than constructed
For now, I recommend to take note of the following rules: 205.1a Some effects set an objects card type
Normally, you get either artifact and enchantment removal OR you get to destroy a creature with flying
Flamewake Phoenix 3.5/10 A 2/2 flying haste for 3 is ok, it has some immediate action and applies some reasonable pressure, particularly to planeswalkers
If you do choose a target, and that target becomes illegal, Waxing Moon is countered, and your creatures wont gain trample
We dont yet have data on what happens to a reprint of a card that has an Extended Art version, aside from the pure reprint of Fabled Passage, which included EA and Foil EA