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It is important to note that this is not a cast trigger, so if you have a way to blink your commander a few times or gain multiple combat steps, you can trigger this effect multiple times in a turn

Valgavoth, Harrower of Souls To get rid of Valgavoth, Harrower of Souls, or leave Duskmourn: House of Horror chances are you need to pay life

Particularly in Commander, where the high bar set for aggro decks all but demands some kind of rapid multiplicative damage scaling, having all your creatures buff each other (for free!) is a true difference-maker

I wish it were a little cheaper so that you could spend more of the early game maximizing this ability