This idea sounds crazy,right?
It's Pot of Greed against Rabbit and stops the Wind-Up loop.
But think about it.
You get a +1 vs Rabbit , but they still have an Evolzar on the field.
Also Maxx "C" is a dead draw AFTER they made their Rabbit play.
What if that Maxx "C" was a tech card like Snowman Eater for example?
You would get rid of Laggia and proceed with your game plan.
So it's pretty subpar/mediocre vs Rabbit in my experience.
It's also almost dead against Inzektors, Heroes and Dark World.
Everytime I played against these decks I wished that Maxx "C" would be something else.I was stuck with dead Maxx "C"s in hand and they were basically a bad version of Upstart Goblin because I had to wait until they special summoned something ( Grapha,Miracle Fusion,Dragonfly into Centipede)
just to discard them for a 1-1 or a +1 when I was extremely lucky.
And they still had field control.
It's a great card against Wind-Up but subpar vs many other popular matchups.
tl;dr
I don't know how big Hieratics are going to be(or how good Maxx "C" is against them) but as longs as the meta is diverse and as long as Wind-Ups aren't overly played I will put Maxx "C" into my side deck. (If Wind-Ups are popular in your area you should obviously main them)