Some self-mill examples might be Sidisi, Brood Tyrant, Grisly Salvage, or Otherworldly Gaze
Each deck brings a different story to the table, and knowing how to pace yourself through the early, mid, and late game is the key to making your strategy work
How to Build a Commander Deck Creative EDH Deck Building Workshop Building a Commander Deck from Scratch Author: Ben Guilfoyle This guide is a structured walkthrough for building your own Commander deck from scratch, not just upgrading precons or netdecking EDHREC
You choose the creature or Vehicle to put counters on after the target opponent reveals their hand and you've decided whether or not to choose a card
Another option is to not declare Medomai as an attacker, which is what the restriction prevents, by using ninjutsu granted to it by Satoru UmezawaSatoru Umezawa
This is an awesome change, as it means they can be powerful but are limited in the decks they can be used