Splintered Thought... well first off, this card is completely useless for raiding. As per raid rule 101.3c, you cannot add or remove cards from a boss player's graveyards or decks. For PVP, this could be an interesting card- pay 5, mill the opponent 5 and then play an ally revealed this way with 5 or less into play under your control. I like it. It combines milling and mind control- a fundamental play strategy for shadow priests. This is almost required for a shadow priest deck in PVP (won't count as revealing a card for Warp), but it is completely useless in raids.