I don't know if this is Android specific or mobile specific, but on my HTC One X (and my friends iPhone 4), drag and drop seem to only work sometimes as intended. Most of the time, the card you try to drag will "shift up" to an aligned with the board position, but stay stuck there until you release the screen and then drag the card again. Then it will happily follow your finger. This happens 100% of the times during the sacrifice phase and most of the times during in-turn gameplay.
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