Rack mana
During my brawl match against the player Snowphi, he was using commander Volo, Monster Guide, and used some rack to generate additional mana, I ask you to check the match log.
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Sigy#26821
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Rezzahan#77802 commented
He has two Nyxbloom Ancients (the original and the copy made with Volo). That's A LOT of extra mana.