you can't cast it without sacrificing a creature, and you can't sacrifice additional creatures
Atraxa, Grand Unifier Atraxa, Grand Unifier has great keywords, the number of colors to be a useful 4-color commander, and a fantastic way to get some cards from the top of your deck
They are just a predefined token cards sometimes create
And to me, that felt like we were sword fighting
Thats what happened with Phyrexian mana and its now mostly considered a design mistake thanks to exactly that
(Unless you're Ken Nagle, in which case you do it right to left.) However, there's an important distinction to make here: you need to see what you're actually going to want to cast at each mana cost, not what you can cast at each mana cost