In this case, giving Deathtouch to Ballista allows you to mow down opposing threats with ease
When Splitting Slime becomes monstrous, you get to put a copy of it onto the battlefield, only this copy doesn't have the Monstrous ability, nor does it have the +1/+1 counters from activating the originals Monstrosity ability
Each precon provides a focused strategy that can be upgraded over time with single card purchases
Getting a 2/2 on the backside isn't busted or anything, but being easy enough to get there in a dedicated Birds deck and also spotting you the first landfall trigger by searching up a land can lead to a surprising power spike and a chunk of damage
Maestros Massacre Maestros Massacre, released with Streets of New Capenna , is a Grixis Commander deck that focuses on the Maestros crime family of that plane
Stephen built around this with a companion here