You can expert merfolk galore, but also some more unusual fantasy races like puffer fish people, penguin people, crab men, walrus women, and something that I would swear was an underwater sliver, if it didn't have the wrong number of limbs
All decks find themselves needing to take some care with their life as there are so many powerful things that can end games out of nowhere if you don't
All of these are just different ways to say you can cast this for something other than whats printed in the top-right corner. Examples of Alternate Costs Let's look at a few major mechanics that are alternative costs
Commandant has no once-per-turn clause, so a second copy can be activated if the first one is negated (except by Called by the Grave, of course)
Weakness: Lighting (x2) Resistance: none Retreat: 1 #59 Azumarill Water HP120 Stage 1 Evolves from Marill [W] Diving Rescue: Choose up to 3 in any combination Pokemon and Supporter cards from your discard pile, show them to your opponent, and put them into your hand
The one on the left comes in English with black borders, Spanish and French with black borders, and Spanish again with white borders