Next time, bring a friend
The not so low casting cost and the fact that it costs two white mana make it impossible to play more than one, but adding one of those to the maindeck has resulted in a big increase of flexibility when it comes to dealing with stuff that has entered the battlefield already
Thats especially true because you can turn token creatures into normal cards too, making commanders like Edgar Markov, who spits out vampires at a machine gun-like rate, even more potent
If all your value engines are destroyed and you're left with a Ludwig Von Drake, you'll struggle to eke out a victory
Gyruda may be a tiny bit better in a Dimir deck due to how easy it will be to cast, but really, as long as your deck is capable of producing either black or blue mana, the card should still be eminently castable and you have to be careful not to get caught in the trap of seeing it as purely a Dimir card, as the majority of two-colour combinations will have access to Gyruda if they want to play it