The Soul Stone is the kind of mana rock we just dont see much in Magic: The Gathering these days
A big part of that comes from Zimone, Mystery Unraveler, who is such a terrifying commander, able to cheat giant creatures onto the board, and facedown, which will always leave your enemies second-guessing
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
So we decided to cut the cards, that cards about lands being in or going to graveyard for now and focus more on triggering Tatyova and friends
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