I Summon a herd of 10,000 Flaming, Yodeling, midget, Highly iradiated (nuclear radiation) ChickenCows to reapeadedly bash their heads against the wall at 500 miles an hour killing themselves instantly, but hopefully damaging the wall.
highfire...no. I actually looked at the stats of a grade 18 prismatic gem, for what it would be as a gem bomb. And as increasing the grade by 2 approximately doubles the power, well...you didn't even get that level of accuracy.
I kamikaze at the wall with a belt of spray paint cans, then if I make it I stop right before I get to the wall and spray paint a clown face on it. After that I give it some popcorn.