To support it without relying on it, I prioritized artifact mana acceleration like Thran Dynamo, Basalt Monolith, and all the artifact creatures I could get
This also combos with Sanguine Bond, Exquisite Blood, or Vito, Thorn of the Dusk Rose to either deal more damage or gain more life
This is where TCGplayer can help out
If youre digging for an answer and the two mana tap hasnt found it, you can even sacrifice the whole thing for one last chance
Depending on what your opponents discard, you can wind up drawing more than the number of cards discarded, since Kefka draws equal to the number of card types among discarded cards
That is super late game for any kind of deck let alone an aggressive deck