The key is might. Thoughtseizing Ad Nauseam on Turn 1 might take a Lotus Bloom, you might stunt a turn of acceleration against a Titanshift opponent with multiple whammies, and if you dont have the kill spell for Goblin Electromancer, you might just need to choke Storms progression
While he is powerful he is also rather on the overkill side and thus spends a little too much time in the Hill Giant camp to balance this
Multiple cards have abilities that begin with "At the beginning of your end step, if you descended this turn." These cards don't need to have been under your control at the time you descended
As it was available in a boxed collection, it seems to be much more prevalent in terms of its rarity, but this Venusaur EXs price has skyrocketed over the years, unlike many other promo cards, which have depreciated in value
But even then, its still a crazy expectation
Each time I put it in the design, development removed them because protection from artifact didn't seem too relevant