Apart from mutate cards to trigger that ability, I guess you could use Stuffy Doll and Brash Taunter, or fill your deck with cards that grant abilities to your commander like backgrounds and the legendary familiars (Kediss, Falthis, et al)
Table of Contents Disney Lorcana maintains a list of banned cards for its competitive organized play, for a more diversified meta
Commander - 1
Gallery and List of Godzilla MTG Cards Anguirus, Armored Killer (Gemrazer) Babygodzilla, Ruin Reborn (Pollywog Symbiote) Battra, Dark Destroyer (Dirge Bat) Bio-Quartz Spacegodzilla (Brokkos, Apex of Forever) Biollante, Plant Beast Form (Nethroi, Apex of Death) Destoroyah, Perfect Lifeform (Everquill Phoenix) Dorat, the Perfect Pet (Sprite Dragon) Ghidorah, King of the Cosmos (Illuna, Apex of Wishes) Gigan, Cyberclaw Terror (Gyruda, Doom of Depths) Godzilla Plains Godzilla Island Godzilla Swamp Godzilla Mountain Godzilla Forest Godzilla, Doom Inevitable (Yidaro, Wandering Monster) Godzilla, King of the Monsters (Zilortha, Strength Incarnate) Godzilla, Primeval Champion (Titanoth Rex) King Caesar, Ancient Guardian (Huntmaster Liger) King Caesar, Awoken Titan (Snapdax, Apex of the Hunt) Mechagodzilla, the Weapon (Crystalline Giant) Mothra, Supersonic Queen (Luminous Broodmoth) Mothras Great Cocoon (Mysterious Egg) Rodan, Titan of Winged Fury (Vadrok, Apex of Thunder) Spacegodzilla, Void Invader (Void Beckoner) What Formats Are They Legal In
