Sona, The Strings

Demacia (When another creature with Demacia
enters the battlefield under your control, place a
+1/+1 counter onto this creature.)
If a creature you control with Demacia dies, you
can gain 2 life.
{2}{w}: You gain 3 life and each creature you
control with Demacia gains +1/+1 until the end
of the turn.