Elderwood Scion

• WOTC Official Reminder Textofficial rules
  Lifelink — Damage dealt by this creature also causes you to gain that much life.

• WWizards of the Coast2012-06-01
  Official Ruling
  Aura spells require a target when they are cast. Elderwood Scion’s cost-reduction ability will affect Aura spells cast targeting it.
• WWizards of the Coast2012-06-01
  Official Ruling
  Elderwood Scion’s cost-reduction ability can’t reduce the colored mana requirement of a spell.
• WWizards of the Coast2012-06-01
  Official Ruling
  Elderwood Scion’s cost-reduction ability can apply to any cost of a spell, including additional or alternative costs.
• WWizards of the Coast2012-06-01
  Official Ruling
  None of Elderwood Scion’s abilities affect abilities that target it.
• WWizards of the Coast2012-06-01
  Official Ruling
  Spells you cast that target Elderwood Scion will cost less to cast even if those spells have additional targets. The same is true for spells your opponents cast costing more.

Rulings via Scryfall