Double cumulative upkeep

[TheRagingMage]

Would having two instances of cumulative upkeep mean that two age counters would be put on it each turn and you would have to pay each payment twice on the first upkeep, 4 times on the second, 6 times the third and so on?

[adventus]

Share the circumstances so we can help

[TheRagingMage]

For example, a {Decomposition} enchanting a {Morinfen}.

[Gorzo]

702.22b: 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.
Example: A creature has two instances of "Cumulative upkeep -- Pay 1 life." The creature has no age counters, and both cumulative upkeep abilities trigger. When the first ability resolves, the controller adds a counter and then chooses to pay 1 life. When the second ability resolves, the controller adds another counter and then chooses to pay an additional 2 life.

In short - each instance of cumulative upkeep will trigger at the dime time. You may stack them in any order, and they resolve 1 at a time. The age counters count towards both.