This is mainly because us Commander players have been spoiled so much with past products
Grim Initiate would be a strong addition to a red aggro or sacrifice deck in Magic: the Gathering, providing early board presence and the potential to amass additional Zombie tokens upon death
Basically, the sideboarding there is planeswalkers out, Carnage Tyrant and Ixalans Binding in. When in doubt, remember the best plan is usually unleashing the giant, implacable death lizard
Any type of token buffs it too, whether it's a creature token or not
It does exactly what you need, which is to swing tempo wildly in your favor
You also have the choice to just put it back in the command zone, which you might want to do if Grenzos not around