Every time Bucky Squirrel Squeak Tutor sees you play a Floodborn Character, your opponent is forced to choose a card to discard
The other half of the cards support the theme indirectly, introducing deserts, sandstorms, scimitars, asps and the like
Best of 1 is just a single game, Best of 3 involves sideboarding for the second and third games, which aligns with how Magic tournament play goes
, : Target creature gains haste until end of turn
You don't need a Jitte to help Dragonlord Atarka or Avenger of Zendikar win a game
In providing board-wide Explore effects to all of your merfolk, Hakbal draws on the +1/+1 counters that have allowed merfolk to succeed in the past, while also providing the option for speedy land ramp