Here's some of them: By casting at instant speed, you can choose what turn you actually want to cast them and when you don't want to cast anything at all
And for fans of chaos, Endless Punishment (Rakdos) slings group damage like a horror movie villain targeting everyone at once
Creatures like Gelectrode, Walking Ballista, and even Mayhem Devil instantly become deadly when given deathtouch
Not being weak to counter magic is nice, but two is twice as much as one, and the restriction of mana value three or less makes it a liability to delve creatures and typically anything that gets reanimated
A lot of these other cards dont have that qualifier, and thats a bad thing to have
Damn is a big deal, but if Lingering Souls has the potential to be too powerful then Damn absolutely does