Originally Posted by
Karhumies
I agree.
The gobbos build already has an excellent mana sink in Moggcatcher, so they don't need Ballista as a mana sink win con. They can just find a Rabblemaster or 2 and go for the beatdown path, or if hiding behind a Bridge get a Siege-Gang Commander and start flinging the Rabblemaster tokens into face. Ballista is the generic equivalent to this package (+ Goblin Sharpshooter as well), all in one card, which is kind of impressive.
At the same time, the cmc2 flex slots in goblin build are already filled up with cmc2 goblin silver bullets which Moggcatcher can tutor up. There is literally no room for Ballista in the cmc2 slot.