It is the most expensive Pokemon card, period, and it will likely hold that distinction for as long as the Pokemon franchise exists
That said, the deck also includes a non-ex Magnezone, which also deals a decent amount of damage, and has the ability to block the opponent's Active Pokmon from attacking
This is partially thanks to how well the cheap creatures available synergise with your big-spell theme, and partially thanks to how the mediocre removal hurts your chances of going long against green ramp players
Wally's Compassion might refer to something you can't see or touch, but you can still feel the calming concern radiating from Wally here
Bea #123 (Pokemon Crown Zenith | Pokemon Cards) prices are based on the historic sales
Thoughtseize is particularly good when you have either something to protect or something you need to prevent, and it just so happens that green can do both of those