No ongoing effect stacks with itself, nor does a bonus or penalty provided by the same effect. It's okay for multiple effects to each grant +2 Attack to a creature, but it can't get +4 Attack from two uses of the same effect. A creature that gains an ability it already has gains only the more powerful version (for example, if it already has Resist 5 Fire and gains Resist 10 Fire, it has Resist 10 Fire, not Resist 15 Fire).
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