I've been playing a Voodoo deck and the last 2 games it's not acted as it should. In both games it was in the last turn, where either the AI would die or I would. In the first game it got down to the last turn and the AI had 36HP and the Voodoo Doll which had Gravity Pull had 36 HP. The AI took its turn, the Doll took enough damage to kill it, then I took damage and died. The AI had 20 HP left. In the second game it was the same deal, except that the AI had 10 HP, the Doll had 42, and at the end of the game the AI had 6 HP.
In neither game did the AI have any Momentumed creatures, or Immaterial creatures which had had the Shard of Wisdom played on them. In both cases, it was just straight up damage from his creatures, and his creatures had more than enough ATK to wipe the Doll out.