Lifelink (Damage dealt by the creature also causes its controller to gain that much life.), hexproof from instants (This permanent can't be the target of spells or abilities your opponents control.)
As long as your life total is greater than your starting life total, Elenda gets +1/+1 and has menace (This creature can't be blocked except by two or more creatures.). Elenda gets an additional +5/+5 as long as your life total is at least 10 greater than your starting life total.
Vintage
