Boulder, Champion of Dro'Akas

Trample, Double Strike, Flying
Boulder, Champion of Dro'Akas enters the battlefield with X +1/+1 counters on him
where X equals the amount of White mana
used to summon him.
{t}{g/w}{g/w}: Remove X amount of +1/+1
counters from Boulder and deal X amount of
damage to target creature or player where
X equals the amount of counters removed.