If an effect would create one or more tokens, it creates twice that many of those tokens instead.
If an effect would put one or more counters on a permanent, it puts twice that many of those counters on that permanent instead.
Whenever chaos ensues, until end of turn, whenever you tap a land for mana, add one mana of any type that land produced.
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1 Jun 2012
Effects that place a counter on a permanent include that permanent entering. For example, a creature that normally enters with one or more +1/+1 counters will enter that many +1/+1 counters on it. A planeswalker will enter with twice its starting loyalty counters.
1 Jun 2012
Adding loyalty counters to a planeswalker in order to activate a loyalty ability isn't an effect, so those counters are not doubled.
1 Jun 2012
Any -1/-1 counters that are placed on a creature because of wither or infect are also not doubled.
1 Jun 2012
The chaos ability is cumulative. For example, if you roll {CHAOS} twice in a turn, tapping a land for mana will cause two mana abilities to trigger.