Crux of Fate is a five mana Black Sorcery that either lets you destroy all Dragon Creatures, or destroy all non-Dragon Creatures
In some of the earliest days of the game, some of the cards released were deemed offensive due to their art, text, and/or name, which were racially or culturally offensive
With flash, flying, and vigilance, it becomes a solid ambusher
This is great for TortEx because it serves as a repeatable removal engine since you can just sac it to its own effect and get it back with the deck's namesake card
They're a cycle done so well that it's authentically difficult to come up with something better
Like Memnite in the Tempered Steel deck of its age, Rootwalla intersected with the rest of the Blue-Green Madness Standard deck to be an actual threat, saving your Wild Mongrel from a removal spell and putting another body on the board