For example, we're going to be running very few creatures, so Liliana, Dreadhorde General, while a great planeswalker, isn't great here
There's a lot of stuff going on with Vraska, Betrayal's String that makes it worth the steeper price point, such as the aforementioned Poison Counters, the Proliferate effect, and even the ability to neutralize threats by turning them into treasure artifacts with its most costly attack, this card can end the game with its Poison Counters alone
This makes Triumph of Saint Katherine very hard to answer short of exiling it
The equip ability on its own, without outside help from cards like Leonin Shikari, cannot be activated at instant speed, so if you play an Artificers Hex on an equipment thats already attached to a creature, they will not be able to remove that equipment before they are in their main phase, guaranteeing you a dead creature