Each of these doubles something for you - be it damage, tokens generated, proliferate triggers, dying triggers or even just the power of your creatures - and each of them can also become indestructible by sacrificing something else
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There are many aspects of a playable card here, so let's start with the obvious, the Darkness typing
Firstly, it's easier to spot a big splashy card that might be good and/or funny in Commander than pinpoint a big player for a more competitive format
Reckon I can pass it off as a work expense
If your Trample creature deals more damage to blockers than needed to destroy them, the excess damage hits the opponent