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Or {Golgari Charm}

 {Reverberate} a {Increasing Vengeance} cast from a graveyard. Make the copy copy the copy, making infinite copies.

This works because Increasing Vengeance from the graceyard makes TWO copies per resolution, instead of Reverberate's only one.

Now have {Nivmagus Elemental} eat off the infinite copy loop, becoming an infinitely large creature.

If you have {Melek, Izzet Paragon} and  {Galvanoth} out at the same time,
you get the top card of your library cast and copied for free before you draw.

Add {Pyromancer Ascension} and you'll get three instances!
And throw in a {Nivmagus Elemental}, you can have him grow by exiling unwanted copies or dead spells!

 {Goblin Test Pilot}
All right, see this guy? He's junk.
Let's see how we can fix this.

How about {Clout of the Dominus}?
Bam. He's now a 2/4 and can't kill himself.

But he can still hit you or your opponent, and any creature still on the field.
{Ivory Mask}.
Bam.
Now he can't touch you.

So, let's make it so if he hits any creatures on our side, it's a good thing.

{Stuffy Doll} can take a hit and smack your opponent for what was dealt to him, so no fear.
{Boros Reckoner} can survive Goblin Test Pilot's pings, so he works fine, too.
{Volatile Rig} is a gamble. Lose the gamble with one of the above on the field and KABOOM! You have a pseudo-field wipe and 8 to your opponent's face.

Any other ideas on how to break Goblin Test Pilot?

I'm wondering what's available in the colors of Orzhov. Any ideas or shenanigans found, beyond  {Vizkopa Guildmage} and {Exquisite Blood}?

 {Curse of Exhaustion} +  {Possibility Storm} or  {Knowledge Pool}. Not quite instant, but it puts players in lockdown.

{Progenitor Mimic} comes to mind, but it costs a bit more mana.

Guttersnipe + Curiosity = Electrolize stapled to each instant or sorcery you cast.
Add Nivix Cyclops for quick beatdowns.