Emerald and Rubys split ability to deal with opponents cards while working toward unleashing its own powerful characters makes it a deck that requires some practice to fully understand, needing some careful cardplay - and good luck - to overcome its less forgiving aspects
The most important advantage Sire has over Koma is its mana cost
Instead, I think it bodes well for the way Wizards of the Coast is handling this set that a Final Fantasy fan would be able to accurately predict what some of their favorite characters might do
According to EDHREC, Soldevi Golem is featured in 60 decks
The D23 promo version of Maleficent, Monstrous Dragon, and every other promo from the event are likely to maintain their value over time, making them solid investments if you happen to have a few in your collection.
If that permanent loses its abilities and then would go to a graveyard, it will still be exiled instead