This mean players have to pump up the toughness of a bunch of creatures with high toughness, then use an effect like E
Ramp is incredibly important in the Commander format of Magic: The Gathering

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Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Dream Devourer: It doesnt matter if Dream Devourer is still on the battlefield or still under your control as you cast the spell from exile