You can store a 100-card double-sleeved deck in the Gyomeland M53R, but it would likely require putting the deck in with the larger plane of the deck facing out which would be precarious and I don't recommend it
The card has already been banned in Legacy for its powerful synergy with Daze and Wasteland and is an elite threat in Modern and Vintage, where it remains legal
It's a fairly effective self mill engine, but also prevents you from losing the game by drawing from an empty library by letting you reanimate a creature instead
It puts out a ton of damage without much effort, and it can give you access to a lot of colors when paired with the right commanders
These are even better when youre sacrificing a creature to put more +1/+1 counters on another creature, like on Malevolent Noble or Gobbling Ooze
When it has no defense counters left, it exiles itself to allow you to cast the reverse side