The blank expressions and glowing green eyes immediately stood out to me as incredibly creepy, especially in contrast to the abundance of running, jaws snapping, and clawing happening in the rest of the artwork in this set
It can search any and all Pokemon, though, which is incredible
Throwing out +1/+1 counters to potentially every other creature you control is amazing, and it wont be difficult to trigger the draw a card clause tacked on the bottom
All in all not bad, and while this one has already jumped a bit in price since the $0.50 it was sitting at for three or so years, I think it has room to grow (especially if were leaning more and more into casting spells from exile) from its current $5.50 price point
I hope this answer is helpful
Short-term price movement is always hard to predict, but several factors suggest Bubble Mew will remain relevant long-term