Thoughtseize lets black decks strip away key threats or answers before they become a problem
This one involves finding the few creatures in Magic that let you break the singleton rule, like Persistent Petitioners or Shadowborn Apostle
What complicates things (and as already mentioned, makes many Commander players dislike this effect) is that your opponents are drawing a fresh grip of cards
In Magic there are lots of cards and lots of decks and therefore many things you need to be able to handle, the larger the format the more this is the case
It works wonders when paired with cards like Supreme Verdict or Utter End, since you can recover a mix of removal, control effects, and threats all at once
Lathril, Blade of the Elves is a Kaldheim commander who provides a nice bit of edge for elves decks by adding black to their color identity