Unlike Duskmourn's other Commander decks, Endless Punishment comes with seven other potential commanders, but none of them have the sort of synergy with the rest of the deck as Valgavoth
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For example, in a creature-based strategy you may want answers to problematic creatures, or even be able to counter spells
Angel of Serenity: My problem playing Angel of Serenity is always if I want to put one or more of my own creatures under it, so that I can rebuild after a Wrath of God
Infect commanders generally revolve around proliferate or poison counters directly, or combat to allow for creatures with infect to attack the opponent directly, oftentimes finding ways around potential blockers
The second is that if youre building your deck to be dense with legendary creatures, which you really want to be doing with Kolvori in your deck anyway, the restriction on using the Crests mana is much less painful