In the old Standard if you really wanted to kill creatures you could stuff your deck to bursting with creature removal
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The deck's commander, Firmuth, Sage of Corrosiveness, is a perfect example of this strategy, as he gets stronger as you mutate creatures under your control
Then for chapters two and three, you get to double the number of each type of counter on a creature you control
So, Wizards made the partner mechanic, which lets you have two legends in the command zone, as long as they both have partner
I think the best part of this is that you could target your stuff, or your opponent can, and you still get the benefit across all your creatures