Glitched Arsonist

When Glitched Arsonist enters the battlefield, it gains a +1/-1 counter for each solid white creature you control.
{x}{u}{r}: deal X damage divided as you choose among other creatures you control, this creature gains +0/+X.
{1}{b/r}{b/r}: as an additional cost destroy this and two other creatures you control, deal damage to target player equal to this creatures power or toughness.