I have a mono red krark's thumb deck (non-commander from back in the day) and your cast/copy situation is basically just a better version of my control (Impulsive Maneuvers, Planar Chaos) I put in that deck
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Drafters will have clunkier drafts, for one thing
With the living weapon ability, it creates a creature token and attaches to it (a precursor to the Job Select mechanic from the Final Fantasy set)
Gengar VMAX Has Wonderful Art & An Interesting Ability In Pokmon Fusion Strike V and VMAX, for those unaware, is very similar to evolving Pokmon except replacing them doesnt change their name or type
lastly Muraganda Petroglyphs is something that really helps the deck if you just don't have the mana to morph your creatures since then they will at least be 4/4 bodies instead of 2/2 ones and odds are it shouldn't help your opponents since no one really plays vanilla creatures in edh