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Its requirements are steep, but they also create an incentive for players to include blue creatures in their decks
Its hard to really combo off with Szarekh because his trigger is tied to attacking, but when the rest of the deck is so explosive (and trust me, it is), sometimes you just need a Commander who can keep you supplied with fresh options
From there, you can focus into a self-mill build to have more tools, or on a Voltron mutate build that combines the mutate effects, with cards like Dirge Bat and Sawtusk Demolisher