Tymna doesnt look particularly powerful to the untrained eye, but it has a couple of key elements that really make it worth playing
It also mitigates the chance of counterspells, thanks to making them that little bit more expensive
First strike, deathtouch Whenever a creature an opponent controls dies, you may return target artifact card from your graveyard to your hand
I was really suprised seeing this thread just pop out for me on a random, but such a considence you was also thinking about it
It may look like its unbeatable in terms of sheer power, but its success still comes down to what your opponent holds in their hand
If Fynn is your commander of choice and your beaters are Gnarlwood Dryad, Bloated Contaminator, and Questing Beast, you should consider that not every table cares for poison decks