There are tons of ways to get counters on creatures so Volrath can turn into them, but my favorite is Tetzimoc, Primal Death, which can repeatedly put a prey counter on any creature for just one black mana
Then, tap the Clue with Urzas ability for blue mana, tap the Top to draw a card and put it on top of your library, and pay 1 mana to sacrifice the Clue, drawing the Top again
Normally, in EDH, you can only have a legendary creature as your commander, or a planeswalker that specifically states it can be your commander
It has a pretty ugly starting point, but if you have Clues and other artifacts and sacrifice stuff, this can get big
Badgermole Cub Badgermole Cub is so painfully obvious it almost doesn't warrant any conversation