all Merfolk, not just yours
Its not just buying the cards that can be tricky, but actually discovering some of the excellent cards you can use can be a trial too
You play a scry land when you can afford a minor tempo hit in exchange for greater consistency
That Flash makes it a combat trick, a removal-dodger, and a wrath-protection piece all in one card, and as we've seen with several cards in the set, Convoke means tribal decks with a wide board can cast it for next to nothing
Even if the Saheeli Rai has been on the battlefield a few turns and has enough loyalty to survive a Shock immediately, after the Guardian Flickers the Sahelli back onto the battlefield, it will no longer survive the Shock, which makes having access to the red instant at all times vital
The motive behind lenticular design is that we want to find ways to add complexity to enhance the game for the more-experienced players without increasing the difficulty for the less-experienced ones