#maloney99

[magicjudge]

If I reveal a split card off kefnet( for this example let's say discovery//dispersal) do I choose which side I want to copy?

Not until you cast the copy from your hand.

God-Eternal Kefnet’s trigger copies the whole card and then allows you to cast that copy of the card. The choice of which half of Discovery//Dispersal to cast is made when you put the copy on the stack.