Formats like Brawl want you to have the specific 60 (for Standard Brawl) or 100 cards (for Historic Brawl), while Ranked formats usually let you have 60 or more cards without coming up invalid
Furthermore, unlike most cards, many variations of the artwork feature the Pokmon doing different day-to-day tasks
He turns decayed tokens into repeatable card draw and replacement bodies , which keeps your board and hand full without overextending
As a commander, Kefka can be ruthless, forcing your opponents to discard cards and sacrifice their permanents (whack a Tergrid in here to be extra mean)
What makes this card so lethal, though, is the fact that on every turn but yours, you can loan it out, ala Assault Suit, to wreak havoc on the rest of the table