This list definitely has subjective biases, so let me know what your favorite Plains are is in the comments
Opposition Agent Opposition Agent is the supreme punisher for decks that rely on tutoring cards
$0.35 Cat-Gator Avatar: The Last Airbender $0.35 Nightmare Sower Lorwyn Eclipsed $0.49 Gollum, Obsessed Stalker The Lord of the Rings: Tales of Middle-earth Commander Decks $0.69 Mortarion, Daemon Primarch Universes Beyond: Warhammer 40,000 $0.35 Ghastly Gloomhunter Zendikar Rising $1.29 Ardyn, the Usurper Final Fantasy $0.39 Essence Harvest Avacyn Restored $0.49 Morlun, Devourer of Spiders Marvel's Spider-Man $0.35 Rouse Mercadian Masques $0.35 Vault Skirge New Phyrexia $0.99 Retribution of the Ancients Khans of Tarkir $1.49 Vampire Cutthroat Eldritch Moon 0 results found
9 Pikachu Trainer Gallery $13.25 Pikachu claims a (likely brief) lead over Gengar's Trainer Gallery card, as Akari shares a sweet nap with the famous Electric-type mouse
Mostly however you will blow up a couple of land of theirs, a couple of yours and they won't care at all and will just continue to kill you
As mentioned above, the set introduced secret rare cards for other legendary Pokemon as well
