Adventures in the Forgotten Realms introduces a dungeon-delving keyword and three dungeons that seasoned D&D adventurers may recognize - Tomb of Annihilation, Dungeon of the Mad Mage, and Lost Mine of Phandelver
However, you don't need the $160 print of Progenitus for this to work
#1 - Ashaya, Soul of the Wild Ashaya takes home the gold medal today as arguably the strongest Elemental in the format (totally in my opinion of course, I welcome other lists!)
Note that if you use Nashi as a Commander, you cannot ninjutsu it from your Command Zone so that won't work unless you find a way to put it into your hand
A different way to play Magic If you've played any of the other Planechase versions before, you should be pretty familiar with how Anthology works
I know some of you with sharp eyes may have noticed the glaring omission of Crumbling Ashes