They arent the explosive, hand filling draw, and they arent rituals or ramp, producing only a temporary mana advantage
Burn is an outlier deck at best, but this does replace some number of Volcanic Hammers in those decks
Diregraf Rebirth Its less likely that youre going to have enough mana after a battlefield sweeper (unless you set off Oblivion Stone or Nevinyrrals Disk, I suppose) to get loads of value from Diregraf Rebirth
Running any non-basics that dont produce White is potentially asking for trouble, as even having one land in play that cant help you cast Anti-Venom will slow you down significantly
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Kestia, the Cultivator is a Bident of Thassa that you'll always have access to if it's your commander but does require some work