This is my second Commander deck that I created. I know it needs Batterskull, but I haven't found one for sale/trade yet. I am trying to create a deck that kills with commander damage, and Kefnet is the only indestructible commander I own who does not lose the ability to attack or block after a creature board wipe. So I built a deck with many equipments and enchantments to allow him to deal lots of damage and give me good effects like life gain and card draw. The rest of the deck are things to keep me at 7+ cards in hand and substitutes for Kefnet if he is removed from the game very harshly. It tried to choose cards that have multiple effects to help win, like how Ring of Evos Isle makes Kefnet big and gives him conditional hexproof. I am not sure what else this deck needs, apart from a way to stop token generators (currently only have Cyclonic Rift and Scourge of Fleets).
So I have a really effective budget Kefnet deck. The list here is a little out dated but very close to what it is currently. Things I would think about it Kefnet doesn't really need very much added to start killing people off. He's already got evasion. You're really looking for +2 or more power and Vigilance. Worldslayer, Dowsing Dagger, and Empyrial Plate. Dowsing dagger is perhaps one of the most insnae cards for Kefnet as it allows you to play the card turn 2 kefnet on three and equip swing on four, then play your land with the flipped dagger. This leaves you with 4 mana up as well as untap with 7 mana.
UBRNicol Bolas, the RavagerUBR
R Jaya Ballard, Task Mage R
2DH / Budget Commanders:
WMangara of Corondor 2DHW
BRXantcha, Sleeper Agent 2DHBR