Here's what the process actually looks like and what separates a real printed card from a DIY proxy
However, they can be played for free if a Character has a cost thats equal to or higher than the Song

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Follow the rules of Magic: The Gathering and the Commander format to play the game.
However, these arent mechanics that individual streamers have developed, but built-in tools for sellers from Whatnot
With a hypothetical twenty lands, twenty one-drops and twenty non-one-drops, the rough math comes out to being 66% that youll hit something relevant to use on turn three