I have a goldfish brain, I know, but recently Ive been trying to make a habit of paying attention to the less exciting, less flashy cards, commons and uncommons in particular, or cards in colors I seem less interested in
Cards like OP08 Tony Tony Chopper and OP04 Tony Tony Chopper are key to this strategy, as they allow you to cheat out additional Characterseither from your hand or from the top of your deck
These rare cards were released as promotional items in various magazines
Wizards has been pretty forthcoming about the fact that most of their testing is focused on Standard, and the delve cards from Khans of Tarkir block are a great example of how cards can be fair in Standard but broken in older formats, as counterintuitive as this seems
azulryu - Gyarados binder, my favorite 'mon
Runner up is the LSV insect token, because of how ridiculous it is