My favorite card to use is the Ruler of the Seas. It is a legendary water splinter. The reason I love this card so much is its power and special abilities. The blast special ability allows it to also damage another card on the field that it was not targeting. When coupled with a plus one magic attack from the summoner it has a devastating attack. Also paired with the Pirate Archer
and Mermaid Healer
they make a nasty combo together. Ive been diving deeper into the splinterland world to learn more and become more succesful. I rent a deck and also play one myself.
Splinterlands so far in my opion is the most robust and well done block chain game out there.