Ada the Lost

Flying
Ada the Lost enters the battlefield with 5 -1/-1 counters on it
Whenever you cast an Angel or Devil spell,
remove a -1/-1 counter from Ada the Lost.
At the beginning of your upkeep, if there are no
-1/-1 counters on Ada the Lost, place a +1/+1
counter on it, then place X +1/+1 counters on
all creatures you control, where X is the number
of +1/+1 counters on Ada the Lost.