Orzhov Keyrune

• WWizards of the Coast2013-01-24
  Official Ruling
  Multiple instances of lifelink on the same creature are redundant. Activating the last ability multiple times won't cause you to gain more life.
• WWizards of the Coast2013-04-15
  Official Ruling
  Activating the ability that turns the Keyrune into a creature while it's already a creature will override any effects that set its power and/or toughness to another number, but effects that modify power and/or toughness without directly setting them will still apply.
• WWizards of the Coast2013-04-15
  Official Ruling
  Until the ability that turns the Keyrune into a creature resolves, the Keyrune is colorless.

Rulings via Scryfall