Sole Sister

Whenever another creature enters the battlefield under your control, you gain 1 life.
Namesake -- Whenever another creature enters
the battlefield, if you control another creature with the same name as this creature, you gain 1 life.
"A single sister of the Amaru cloth can provide only
so much guidance. If you were to reunite them, however..." -- Erudil to Bjeldor Harkenlaer