Maresha Serd, Advanced Curer

Whenever an effect would cause you to gain
life, you gain 1 additional life for each instance
of life gain.
Whenever you gain life, you may choose to
put that many +1/+1 counters on Marseha Serd, Advanced Curer instead.
{1}{w}{w},{t}, Remove X +1/+1 counters from
Marseha Serd: Target player gains X life.