Not only could it kill them through commander damage, but itll kill the attacking creature at the end of the turn

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So, unlike Eldrazi, where getting rid of Eye of Ugin turned the deck from an oppressive monster into just another tier-one deck, I'm not sure this is possible with Dredge
Commander can be a completely different animal from head-to-head Magic, but Path To Exile is just as useful when you're facing three opponents as it is against just one
Any cards which dont fit into one of those categories are probably lowering your power level, so consider how many you play when finding the right balance for your table
Depending on the action, the threat alone might keep your character safe while you build up the ink you need for Restoring The Crown