When recycling cards during mulligan or with effects like Dazzling Aurora, do you need to shuffle the recycled cards before placing them at the bottom of the deck?

Ruling: Yes, when 2 or more cards are recycled simultaneously (whether during mulligan or from card effects), they must be placed at the bottom of the deck in a random order, which requires shuffling them.

Nuances:

• While shuffling only 2 cards can be easily manipulated, your opponent has the opportunity to shuffle again
• You won't gain much information from knowing the order of cards on the bottom of your deck