We have already seen this card rise in popularity because decks like 6C and CoKE run a lot of Special Energy
Its not a long list, but its one worth knowing
In Commander, you'll be able to make good use of Final Showdown, paying six to destroy all creatures, one more when there's something important you want to protect, and one more when you want to get rid of some pesky indestructible stuff too
While it can be fun to win convincingly, we don't want to regularly pit newer players who are learning the ropes against seasoned veterans with advanced skillsets and create situations where these outcomes are much more likely
ST20 - Yellow Charlotte Katakuri OP03-099-charlotte-katakuri fell off in popularity in OP09 and OP10, and there aren't any cards in Starter 20 that are meta-relevant to justify favoring it over other Starter decks
Do Any Other Cards Besides Planeswalkers Create Emblems