Combined with Dune Chanter below, this can grab you any land out of your deck, and even when limited to Deserts theres plenty of good options
It goes particularly well with a sacrifice outlet such as Viscera Seer, or Ashnods Altar if you want to generate colorless mana
But we have to pick something
This article looks at coin flip commanders, chaos tools, Krark and Sakashima combo lines, old-school oddities, modern payoffs, and how Krarks Thumb turns randomness into a real deckbuilding strategy
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
By all accounts this is a green dragon: its hasty, pressures your opponents life total, and takes out their planeswalkers