Many of the cards feel like not much more than leftovers from the main set, the set is not draftable, and it's only available in full-priced Collector Booster packs, even though each pack only contains six cards
Over at TCGplayer, they took data from over 8,000 packs of Astral Radiance in order to determine just how difficult it is to pull some of the recent sets hottest cards
You can put the blight counters on your own lands and use this to ramp up into something silly, like Bahamut, but I dont think that really factors in here
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Two mana to discard two cards is also just an incredible price, and is especially potent when Hymn to Tourach follows a turn-one discard spell like Thoughtseize or Inquisition of Kozilek