Pete, King of the Year 9's

When this card enters the battlefield destroy all
of the Year 9 Childs's you control then give this
card a +2/+2 boost for every year 9 you destroyed
(if you then place another Year 9 Child after this
cards placement and if this card is still on the battlefield immediately destroy the Year 9 Child
and place a +2/+2 counter on this card)