There's a big advantage to sneaking it onto the battlefield, despite the cost, because when it deals combat damage to an opponent, you can pull a creature from that player's graveyard, which then enters the battlefield under your control, tapped and attacking that player
It's very strong at the kitchen table and you can check it out here - Getting Nasty in Commander with Nashi | Article by Abe Sargent (coolstuffinc.com) The sixth deck I built was a Mono-Blue Artifacts list built around Katsumasa, the Animator
If you just came to this article to see Pentarch Ward, Curator's Ward, and Spectra Ward mentioned, well there you go
It's one of, if not the most active TCGs out there
Because Imodane doesnt care if you cast or copy the spells she sees, that means every single opponent is about to take five loads of 27 damage directly to their face - for a total of 135 damage each