You can check out how to use those in our guide, here
Once you establish a flow of lifegain and Hope on the battlefield, you can start running away with the game
Scarcity and special treatments
"...fans can expect to see some of their favorite characters in the 99 of each deck..." Last but not least, Commander might be all about your leader, but RPGs are often about your party as a whole, and WOTC wont leave the supporting casts of these games hanging
But, of course, the other factor is that this is Mickey Mouse we are talking about
Kefkas ability to wear down your opponents while helping you keep a steady supply of new cards feels extremely relevant to the current midrange meta in cEDH, although Im not sure that he will outperform Tymna the Weaver // Kraum, Ludevics Opus