Obolo, Elder-Swamp Warlock

{t}: Add {g}{g}{g}. Spend this mana only to cast creature spells.
{t}: Add {b}{b}{b}. Spend this mana only if you've
lost 3 or more life this turn.
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"Do not go further than the shallows. It is not wise
with the warlock lurking in the depths."
—Chevill, Bane of Monsters