Magmatic Sinkhole Magmatic Sinkhole was a nice removal spell in Draft and Pauper, but thats it
Obviously, this gets even better with any sort of Equipment, or Auras like Rancor, and is likely the owner of the best colorless mode among Prototype cards
Its particularly good for nonspecific tribal decks that have multiple creature types, like Sea Creatures (Leviathan, Octopus, Serpent, etc)
Auras that have card draw attached, like Angelic Gift or Rune of Sustenance, put cards back into your hand, letting you skimp on expensive white card draw spells

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