Edge of Malacol

• WWizards of the Coast2012-06-01
  Official Ruling
  While Edge of Malacol is face up, the normal turn-based action of untapping your creatures is replaced. Those creatures won’t untap. Other tapped permanents you control will untap as normal.
• WWizards of the Coast2012-06-01
  Official Ruling
  Other spells and abilities can untap creatures as normal. In that case, they’ll just untap. You won’t put any +1/+1 counters on them.
• WWizards of the Coast2012-06-01
  Official Ruling
  If you untap a creature you control during another player’s untap step (perhaps due to Seedborn Muse’s ability), that creature will untap normally. You won’t put any +1/+1 counters on it.

Rulings via Scryfall