Telepathy is $40 with a $25 buylist, Sisays Ring is $16 with a $10 buylist, Intrepid Hero is $21 with a $15 buylist and Arcane Laboratory is $50 with a $27 buylist which reflects a real lack of confidence in that $50
Amazing Spider-Man has decent stats and keyword abilities, but you don't want to attack with it all the time due to how much mana you need to transform
Here is everything you need to know about their collectability and quality
For portfolio-style value tracking Collectr is the strongest alternative, and the TCGplayer app is the one to use for buying and selling
Use a Pokemons ability (these will usually be once per turn, per Pokmon, but will be specified on the card)
One of the easiest ways to evaluate the mechanic is to break down whether or not youd be playing the card if it just gave you a 2/2 token instead of manifesting dread