Emma, Bright Watcher

When Emma, enters the battlefield, put a +1/+1
counter on target creature you control. Whenever
a creature enters the battlefield under your
control, put a +1/+1 counter on any creature you
control. Whenever a creature you control dies, if
it had any number of +1/+1 counters, you gain
life equal to that creature's toughness.
{w/b}, {t}: remove any number of +1/+1 counters
from a creature you control, lose that many life,
draw that many cards.