mtg feather commander deck EDH Deck Feather, the Redeemed 100 Magic Cards Custom Deck Combat Boros $60 Feather, Radiant Arbiter -

Umori, the Collector Choosing creature with Umori, the Collector makes all of your rats cheaper to cast, making it a natural commander for Rat Colony

Ramp cards and other discard effects are prime examples of things that scale down and lose loads of value when sat under a Maggot or Fiend

Id probably build this as a sacrifice deck to more consistently activate this commanders abilities

Rinse and repeat, and, with enough mana, it is very easy to cast your entire library

If youd rather something a little more involved, you can play Manifold Insights to let your opponents work together to your benefit

Forgotten Ancient and Taurean Mauler come to mind