Vexing Sphinx

Creature — Sphinx    (CMC:3)

Flying Cumulative upkeep—Discard a card. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When Vexing Sphinx dies, draw a card for each age counter on it.

50 CSP • ENLars Grant-West

™ & © 1993—2006 Wizards of the Coast

Legal in: Modern,Ice Age Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Vexing Sphinx {1}{U}{U} Creature — Sphinx Flying Cumulative upkeep—Discard a card. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When Vexing Sphinx dies, draw a card for each age counter on it. 4/4

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7/15/2006
If Vexing Sphinx has more age counters on it than you have cards in your hand, you can't pay the upkeep and you must sacrifice it.
10/1/2008
Paying cumulative upkeep is always optional. If it's not paid, the permanent with cumulative upkeep is sacrificed. Partial payments of the total cumulative upkeep cost can't be made. For example, if a permanent with "cumulative upkeep " has three age counters on it when its cumulative upkeep ability triggers, it gets another age counter and then its controller chooses to either pay  or sacrifice the permanent.

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