Oracle

Artifact 

T, Sacrifice Dark Sphere: The next time a source of your choice would deal damage to you this turn, prevent half that damage, rounded down.

Tournooi-info

Legal in: Vintage, Legacy, Commander

Officiele rulings

4/15/2013
If two or more of these effects would apply, you apply them sequentially. So if the source would deal 5 damage after two of these abilities have resolved, the first one prevents 2 damage, reducing it to 3 damage, then the second one prevents a further 1 damage, reducing the total damage dealt to 2.

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