Let me tell you about the time my son and I battled with literally hundreds of oozes and zombies. This was 10 minutes ago.
So, it starts off poorly for me, with him getting to Ultimate a flavor of Liliana that gives him an emblem that reads “gain X zombie tokens on your end step, where X is the number of zombies you control plus two” or something. So he had a few on the table already, and gained four or so zombies. Not great.
Meanwhile, I have a few Biogenic Oozes and other oozes, and a decent army built up to try and overwhelm him. I drew Vigor (my guys don’t take damage, but gain that many counters instead) and decide to put down a Vedalkin Orrery so I can play anything at instant speed, and I attack. He double blocks with most of his zombies, and I flash out Vigor and my guys only grow in power while he loses several zombies.
Then he drops Endless Ranks of the Dead where on his upkeep, he gains half again as many zombies as he controls. This coupled with the Emblem is going to get out of hand, fast.
However! Then I draw and play Nyxbloom Ancient, all my stuff is worth triple mana! I use all the mana I can to make three oozes with the Biogenic Ooze, then tap my Gaea’s Cradle for like 30+ mana and make even more oozes - none of my guys take damage and only get stronger, and I have more zombies than he does now!
Then he plays Coat of Arms, so all creatures are +1/+1 for each other creature that shares a type with them. My oozes and his zombies are individually so large it only takes one to get through and kill someone.
A few turns go by, and at one point I tapped the cradle for almost 300 mana, but it wasn’t enough, he eventually overwhelmed with over 260 zombies, and I only had 225 or so blockers on the board.
It was an absolutely nuts game, and we loved every minute of it. Here are some shots from the game - I stopped recording +1/+1 counters very early in, each Ooze was really about 80/80 or so at this point due to the Coat of Arms, so it wasn’t necessary. I think if this happened in a game of Arena or MtGO it would have crashed it.