Varderlum, Usurper of Light

Event Color Drain —
Until the beginning of your next upkeep, if a
land is tapped for mana, it produces {c} instead
of any other type and amount.
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{t}: Add {c}{c} to your mana pool.
At the beginning of your upkeep, players may
pay 2 life. Until the beginning of your next
upkeep, lands those players controls have
"{t}: Add one mana of any color."