Fendeep Summoner

• WWizards of the Coast2008-04-01
  Official Ruling
  You may target zero, one, or two Swamps with this ability.
• WWizards of the Coast2008-04-01
  Official Ruling
  A Swamp affected by this ability is subject to the “summoning sickness” rule: If its controller hasn’t continuously controlled it since the beginning of their most recent turn, it can’t attack or be tapped for mana (or use any other abilities).
• WWizards of the Coast2008-04-01
  Official Ruling
  A Swamp affected by this ability is still a land, still a Swamp, and may still be tapped for black mana. If it had any other card types or subtypes, it retains those as well. This ability doesn’t affect the permanent’s colors, if any.

Rulings via Scryfall