Wild Nacatl

• WWizards of the Coast2008-10-01
  Official Ruling
  Wild Nacatl's abilities check for lands with the subtypes Mountain and Plains. Those lands don't need to be named Mountain and Plains. Wild Nacatl will get both bonuses if those two subtypes are contained among the lands you control, even if they're from the same land (such as Plateau or Sacred Foundry).

Rulings via Scryfall

• WO
  Wizards of the Coast2015-02-03

  Wild Nacatl was unbanned in modern on February 3, 2015. The second round of unbannings sought again to diversify the format. Wild Nacatl has since taken its place in the Modern metagame, but has yet to truly break out again. Source: https://magic.wizards.com/en/news/arcana/brief-history-modern-banned-list-2015-02-03
• WO
  Wizards of the Coast2015-02-03

  Wild Nacatl was banned in modern on February 3, 2015. We have the goal of maintaining a diverse format. The heavy majority of all aggressive decks were Zoo decks. Wild Nacatl was particularly punishing to anything with less than 3 toughness. Source: https://magic.wizards.com/en/news/arcana/brief-history-modern-banned-list-2015-02-03
• WO
  Wizards of the Coast2011-12-20

  Wild Nacatl was banned in modern on December 20, 2011. Wild Nacatl is a creature that simply attacks and blocks very efficiently. This creature is so efficient it is keeping too many other creature decks from being competitive. So, in the interest of diversity, the DCI is banning Wild Nacatl. Source: https://magic.wizards.com/en/news/feature/explanation-december-2011-br-changes-2011-12-20
• WO
  Wizards of the Coast2014-02-03

  Wild Nacatl was unbanned in modern on February 3, 2014. At the time Wild Nacatl was banned, we hoped that this would allow room for other aggressive decks to shine. We expect that with the return of Wild Nacatl, those decks will return as a viable option. Source: https://magic.wizards.com/en/news/top-decks/february-3-2014-dci-banned-restricted-list-announcement-2014-02-03