The only real drawbacks here are that it costs 4 mana and it's just 3/3
When Court of Vantress becomes a copy of a permanent, it's neither entering nor leaving the battlefield
However, you can also pay one and a Blue to cycle it, and when you do so, each opponent mills four cards, so its got a little bit of versatility to it, which is nice
The question inspired Philip K
While others like Sorin and Ral focus more on combat boosts, Tamiyo helps speed up your deck and pull out your best options
They say that when its the first card for a new Pokmon then they want to ensure it captures the uniqueness of the character and be more sincere about showcasing the core attributes of the Pokmon correctly, whereas with Pokmon that have been around for a long time they have more license to use more inventive and unexpected art styles