The issue is that the floor of the card (when its only making three or four mana) is still way too high, because Dockside is a card that can be looped, reanimated, flickered or cloned to such a degree that simply making an extra treasure or two is still enough to win the game
That's patently absurd with 0-mana targeting abilities like Lightning Greaves, and still incredibly strong if you just play it fairly in a normal game of Magic
I dont know if theres a protocol, or an explanation, but the less rares the better when it comes to getting the more chase cards
Goldin Auctions reports that the cards are all rated at GEM MT 10 (translation: practically perfect), and that, "while the cards have rounded corners, they are still very difficult to attain in GEM MINT condition
The Bench cannot have more than 5 Pokemon on it at any time
Speaking of combat, it also gains Myriad