Mwonvuli Ooze

one green mana Creature — OozePower and toughness1+*/1+*

Cumulative upkeep two generic mana (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay for each age counter on it.)

Mwonvuli Ooze's power and toughness are each equal to 1 plus twice the number of age counters on it.

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9 printings

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Mwonvuli Ooze rulings

2008-04-01
If you choose not to pay Mwonvuli Ooze’s cumulative upkeep, it will still get an age counter before being sacrificed. Its power and toughness will momentarily increase before being put into the graveyard, which might matter to certain other cards (such as Proper Burial).
2004-10-04
Its power/toughness changes when the cumulative upkeep resolves, not when it triggers.

Mwonvuli Ooze keyword rules

Cumulative upkeep Rule 702.24

Cumulative upkeep is a triggered ability that imposes an increasing cost on a permanent. “Cumulative upkeep [cost]” means “At the beginning of your upkeep, if this permanent is on the battlefield, put an age counter on this permanent. Then you may pay [cost] for each age counter on it. If you don’t, sacrifice it.” If [cost] has choices associated with it, each choice is made separately for each age counter, then either the entire set of costs is paid, or none of them is paid. Partial payments aren’t allowed.

If a permanent has multiple instances of cumulative upkeep, each triggers separately. However, the age counters are not connected to any particular ability; each cumulative upkeep ability will count the total number of age counters on the permanent at the time that ability resolves.