While theres certainly no requirement, playing a commander like Vrondiss, Rage of Ancients or Wyll, Blade of Frontiers (alongside a green background) makes this even more enticing
As a two drop it isn't exactly gaining you much tempo either
I like to play it with white cards that make tokens when I gain life, or alongside cards like Black Market and Life Insurance that can help to produce mana
So, it's that much tougher to find a given version of Nazgul, and players who wish to collect all nine will have to pay top dollar for them
For each permanent destroyed this way, its controller creates a 3/3 green Centaur creature token
Avoid Fate is one of the best protection spells you can get in a non-blue Commander deck, and nobody is ever expecting you to hard-counter their Darksteel Mutation or Imprisoned in the Moon with a 1-mana green counterspell