So, attacks made with both sides of Kefka will count towards the 21 damage needed to take someone out of the game with commander damage
When the group begins the fight, they will want to approach from the left and right sides: the tank from one side, and the DPS and healers from the other, giving the pillars a wide berth
Ideally, you want to build up to a Turn Five Aladdin, Heroic Outlaw and follow it up with big questers like Kuzco, Temperamental Emporer, Hans, Scheming Prince, and Mad Hatter, Gracious Host, while building a healthy board of Evasive characters like Pongo, Ol' Rascal, Tinker Bell, Most Helpful, and Genie, On the Job
Each room as you journey through Undercity has nice effects for various Commander battlefield states, and the final room is going to be awesome for most Commander decks that play a reasonable number of creatures
However, there are exceptions
This desire to help humans survive is reflected in his design