Whilst it could certainly benefit from additional mechanical complexity, more cards and tools to help adjust the pace (at the moment, games move very quickly), many of these problems are indicative of its infancy
Furthermore, it can be also appropriate to counter the Initiative creatures themselves while attacking the mana development of the deck
I am also running all of dual lands that aren't named "Taiga" here for that purpose
Gisela is one of my favorite bombs in Commander because she speeds up the clock on your opponents while also reducing the efficacy of aggro against her controller
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There are "collect me" cards at common, like Relentless Rats and Squadron Hawk, but those are hardly going to be all your deck is doing