Armin, Clever Strategist

Partner
Armin, Clever Strategist enters the battlefield
with a +1/+1 counter for each creature your
opponents control.
{r}{g}: Put a +1/+1 counter on Armin.
At the beginning of your end step if Armin,
Clever Strategist has 10 or more +1/+1 counters
transform it.