5 Thieves' Auction Like Scrambleverse but slightly better, Thieves' Auction has the same effect while introducing a level of choice into the matter
Its pretty 5-color soupy, but that hasnt stopped players before
It's well worth the risk of drawing it on turn ten

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These would usually stand out on maps, having a distinct circular shape compared to other forests you encounter through the games
Instead, it makes it so that all black mana symbols in a spell's mana cost double as Phyrexian mana symbols