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Of the possible commanders, most of them are going to do very well in their niches

A Languish that gives the monarch is maybe slightly overcosted at six and could have happily been five but I think its absolutely fine at six mana, anyway

Take a look at Up the Beanstalk from the last Standard set and how thats impacted multiple formats, for example

And because its power granted equals the number of creatures you have, the damage is multiplicative, not additive like most other team pump effects

So if you have ways to sacrifice creatures for value something that Grixis (blue/black/red) has plenty of ways to do you can get even more value out of them