Horizon Drake

• WOTC Official Reminder Textofficial rules
  Protection — This permanent can't be damaged, enchanted, equipped, blocked, or targeted by [quality].

• WWizards of the Coast2010-03-01
  Official Ruling
  Protection from lands works like any other protection ability. Horizon Drake can’t be blocked by land creatures, all damage that would be dealt to it by lands (including combat damage from land creatures) is prevented, and it can’t be the target of activated or triggered abilities from lands (including your own Teetering Peaks, for example).

Rulings via Scryfall