, Sacrifice Dark Sphere: The next time a source of your choice would deal damage to you this turn, prevent half that damage, rounded down.
"I was struck senseless for a moment, but revived when the strange curiosity I carried fell to the ground, screaming like a dying animal."n—Barl, Lord Ith
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.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.