Zarum, Mercyful Protector

Whenever Zarum, Merciful Protector or a
creature you control enters the battlefield you
may pay {1}. If you do that creature enters the battlefield with a shield counter on it.
Whenever you remove a shield counter, from
a creature you control, put a +1/+1 counter on it
and draw a card.
"Given time and care, the smallest of saplings, may
grow into the mightiest tree"