Lisa Lloyd shares a lovely reading and spread using a multi-deck approach concerning a dream vision/visitation from Dolphin. Tarotize: A Dolphin Abundance Blessing Reading.
As Lisa writes at her blog; "Is the thought of connecting psychically with dolphins too woo-woo for you? Then stop reading right now!
I would have laughed at the idea myself not long ago if it weren't for a dream I had of dancing with dolphins."
One of the decks used in her spread is Doreen Virtue's Magical Mermaids and Dolphins deck, which I have and absolutely love.