Experienced players often categorize this card among the best instants MTG has ever seen because of its unparalleled efficiency
cards on your field, play up to 1 [King] with a cost of 7 or less from your hand
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There is a decent chance you will not get any value from Oracle of Mul Daya the turn you play it, but its also possible that your opponent has Narset, Parter of Veils in play, keeping you from drawing cards off your Mulldrifter
About 25% of those it doesn't hit are because they are white and the remaining 15% or so are non-white dorks with 4 or more toughness