I think
blightning is more of a sideboard card here. 3 mana for 3 damage isn't the greatest, and letting them choose which creature to destroy (esp among the larger ones, as a lot of problematic creatures are the utility creatures with low power) is a lot less helpful than i'd hope. i would agree with KouriNick and use command. you have lots of creatures to return, and it deals damage fitting the 3 CMC spot still.