Red and green are the best, and for red, the reasons include cards weve already mentioned: Dockside Extortionist and Jeskas Will, but also Mana Geyser
Scar, Vengeful Lion will help with card draw, as every time you challenge an already damaged character, you can take the top card of your deck and tuck it safely into your hand
The leader of the two sides are even brothers in both
It lets you draw a card and proliferate which means you are able to add an additional counter to any creatures you control that already have a counter on them
Ideal for trading cards, board game cards, and more
Compared to special arts and art rares and all the new stuff Pokemon has done since SM, rainbow rares are the least desirable and most creatively bankrupt