If this face-up card is returned from the field to your Deck, select and Special Summon 1 Level 3 or lower monster from your Deck to your side of the field. Then shuffle your Deck.
Rulings
Individual Card FAQs
When "Serpentine Princess" is returned to the Deck by an effect occurring in a chain, the effect of "Serpentine Princess" starts a new Chain after the current Chain resolves completely.
If the effect of "Fiber Jar" places "Serpentine Princess" from the field into your Deck, the effect of "Serpentine Princess" is activated and will be applied after the effect of "Fiber Jar" has finished resolving.
WATER|
Level 4|[ Reptile / Effect ]
ATK 1400|
DEF 2000