A chase card is the card collectors open packs hoping to hit the intersection of low pull rate, standout artwork, and market demand
Szat betrayed the Titans and murdered two of their number before Urza, having anticipated Szat's betrayal, killed him in turn, using Szat's essence to power the soul bombs the Titans used against Phyrexia
But the goal is to gain a ton of life, transform it, and immediately one-shot someone with the planeswalkers -1 ability
Selfless Safewright Saffgor: Same issues as Collective Inferno above: It's a bit too pricy for how specific it is, and will always die to the wipe itself
So, prices may quickly deflate
Champion of the Path Saffgor: This represents a lot of damage, and while there is an opportunity cost, it's only temporary