Basically, everything that is very unlikely to contain a card shape is discarded
What creature do you want to turn face-up for 2 mana
After Michiko's reign ended, Kyodai continued to bond with and provide sage advice to each successive emperor of Kamigawa, until now, when the current emperor's planeswalker spark ignited, sending the emperor wandering the Multiverse and leaving Kyodai lost in a constant state of confusion
3 - Gardevoir (Secret Rare - 245/198) It's in third place for two reasons: 1) the playability of the card in the scenario of psychic archetypes, predominant in the current metagame
In a sense, it might be preventing opponents from curving out or double-spelling, which is a huge advantage, just not a tangible one you can always track
So, one of the best ways is to use card sleeves