I've found it situationally useful, but it was more of an inclusion because its a card I had on hand. Usually useful in removing a creature - especially if your opponent has some kind of deathtouch - the attached
lightning bolt usually clears the way for all the big dino's to swing after a stalled board state. But YMMV, definitely not an auto include, always build for your meta. With my landbase, I have rarely been hurting for mana when we get to the point of casting a 6 cost spell.