With its Blizzard attack, it can deal 80 damage to the opponents Active Pokemon and an additional 10 damage to each of their Benched Pokemon
Worse versions of existing competitive commanders/decks - another facet of what makes a deck competitive is not choosing to play something that's consistently going to perform worse than another build with the same strategy (for example Prime Speaker Zegana/Keruga, the Macrosage could also be a solid Simic Food Chain deck, but Uro, Titan of Nature's Wrath is the best choice for this kind of deck for cEDH)
Basically, it milled the opponent every time he or she cast a spell
When you pair it with Leonin Arbiter, it effectively becomes a Wasteland with legs
Leyline of the Void solves this problem by being free at the start
This flies in the face of the argument that occasionally comes up from the MTG Finance community (many of whom have a vested interest in the Reserved List) saying we should simply stop talking about the Reserved List and accept its currently detrimental impact on the game