Pili-Pala

• WWizards of the Coast2008-05-01
  Official Ruling
  Pili-Pala’s ability is a mana ability. It doesn’t use the stack and can’t be responded to.
• WWizards of the Coast2008-05-01
  Official Ruling
  Using this creature’s ability means you’re untapping it for mana, not tapping it for mana. Mana Reflection won’t cause it to produce extra mana.
• WWizards of the Coast2008-05-01
  Official Ruling
  If Pili-Pala is already untapped, you can’t activate its ability. That’s because you can’t pay the “Untap this permanent” cost.
• WWizards of the Coast2008-05-01
  Official Ruling
  If a creature with an ability hasn’t been under your control since your most recent turn began, you can’t activate that ability, unless the creature has haste.

Rulings via Scryfall