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Artifacts such as Contagion Clasp and its bigger sibling Contagion Engine let you invest mana into proliferate triggers, turning them into engines your opponents must answer

You don't have to reveal the card even if it's an artifact or creature card

Secondly, being aggressive with a commander like Jirina Kudro is a good way to punish players for clunky precon mana bases or inconsistent starts, both of which are issues for some of the other precon decks

It's a little bit of a shame that some of the more exciting commanders are the non-legal ones, but you're still able to play with them if your playgroup is okay with it