Thanks in large part to the effort @circlehunter put into their spreadsheet, Im pretty sure my collection has nearly reached completion
A foil shows up as a second rare on very infrequent occasions
I have no idea why they went for creatures wearing hats specifically, but Id like to believe that Wizards just wants to stir a fuss and get players to fight over whether or not soldier helmets count as hats
finding a Claydol GE as you could consider success as finding any Pokmon card, but this does not hold true for the situation at hand, which is a very likely scenario during a game
Playful Shove Playful Shove is easier to pull off than Slick Sequence, and both of which will find homes in Izzet prowess decks in Standard, Id say
Both 1st Edition and Shadowless versions of the Base Set Nidoking are worth hundreds to thousands in PSA 10