Legality depends on the tournament format -- Anti-GMX Final Experiment can be legal in some formats and banned or restricted in others
While the other Kaijus are scary threats in Commander, it is very easy for Godzilla, King of the Monsters to simply destroy an opponent in one swing
If you go first then theres a real chance your opponent will simply skip to the battle phase, activate Evenly Matched , and your entire board is gone.
Bonsly from Diamond & Pearl (Common) Yes, this is a real Pokemon card, and as you can see, theres a hole in it
On the other hand, you can try to hold back and let one or two creatures do their work but then a Thragtusk threatens to come down, gains you five life, trades in combat one turn, and chump block another, easily buying three or more turns
Zeraora GX #221 (Rainbow Rare, Lost Thunder) If you want to lean into the vintage angle, this is the play