An ability that triggers on an event that causes a creature to die doesn't trigger twice
Sure, you will likely get a win or two off with the instant-lose ability, but getting a six or seven drop legendary creature out on turn two or three is much more reliable
If you are in the correct colors, then you can even take advantage of Krosan Verge as a sort of super fetch land
We saw the Galarian Moltres take off with a huge rise, but I don't think we'll see the same here
All of these actions triggering without requiring combat is extremely effective, and when paired with other ways to boost the power and toughness of creatures, all while backup Commander Director Nick Fury is reducing the cost of Heroes by 1C, you can see why this deck is being hyped up as powerful right out of the box
Then you spend months unsuccessfully trying to get your friends together because getting a table of four to six people to do something on a regular basis is near impossible