The payoff is okayish, with the third chapter trigger being particularly spicy if you've got Firecat Blitz, but the cost of discarding your hand and the risk of the saga being destroyed before you get to the second chapter is too risky for me
There are a few reasons for this, and only one of those is that Xolatoyac, the Smiling Flood, one of the new commanders, is a massive damn Axolotl
Other times, you'll need to be more careful
If you assemble Tron on turn three and you dont have a Karn Liberated in hand to cast instead (which is what you really want in these matchups), then you can cast your Thoughtseize-on-a-stick and present a clock that will kill your opponent on your eighth turn
The Soul Stone is the kind of mana rock we just dont see much in Magic: The Gathering these days
But that uncertainty is part of the appeal: its a very swingy, exciting game where pulling just the right card at just the right time can transform your fortunes