Soul Tithe

Enchantment — Aura    (CMC:2)

Enchant nonland permanent At the beginning of the upkeep of enchanted permanent's controller, that player sacrifices it unless he or she pays , where X is its converted mana cost.

23 RTR • ENDave Kendall

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Legal in: Modern,Extended,Return to Ravnica Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Soul Tithe {1}{W} Enchantment — Aura Enchant nonland permanent At the beginning of the upkeep of enchanted permanent's controller, that player sacrifices it unless he or she pays {X}, where X is its converted mana cost.

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10/1/2012
The converted mana cost of a creature token is 0, unless that token is a copy of another creature, in which case it copies that creature's mana cost.
10/1/2012
If the permanent has  in its mana cost, X is 0.

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