Is it common to end the sentence with 事 ? (not the imperative case)
I have often encountered sentences such as
我が望みは、爆裂魔法を放つ事。
My only desire is to let off Explosion.
I understand that 事 is the 事 of nominalization and it could be followed by だ or です。
What nuances does the absence bring (if any) when compared to
我が望みは、爆裂魔法を放つ事だ。
or
我が望みは、爆裂魔法を放つ事です。
Due to the usage of 我が, I would be inclined to think it gives more formality, but I am not really sure.