Suggestion: change "Whenever you cast a spell" to "Whenever you play a spell", to distinguish it from effects like Puzzle Box or Tortollan Pilgrim : r/hearthstone
Hearthstone - When you drop Yogg-Saron's Puzzle Box and it doesn't go as planned. | Facebook
Oh My Yogg! - Hearthstone Top Decks
Hearthstone reveals latest expansion Saviors of Uldum featuring new type of spells - Mirror Online
Hearthstone, Saviors of Uldum: Card, Epic, Mage, Puzzle Box of Yogg-Saron - Millenium
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Hearthstone - "PUT THE BOX DOWN, RENO!" | Facebook
HSReplay.net on Twitter: "Here are some of the best and worst spells randomly cast from Puzzle Box of Yogg-Saron! https://t.co/ez8CPy69Vs https://t.co/zw4kMclyQf" / Twitter
Battlegrounds/Puzzle Box - Hearthstone Wiki
Puzzle Box of Yogg-Saron - Hearthstone Wiki
Hearthstone, Saviors of Uldum: Card, Epic, Mage, Puzzle Box of Yogg-Saron - Millenium
Japanese puzzle box 21steps Fuji and Tsubaki – Karakuri Museum