Swim

Merge your islands (Merged lands tap for the
effect times the number of lands merged with it).
Enchant island. Enchanted island gains: "{u}, {t}: Put a creature with creature types swim or fish
onto the battlefield without paying the mana cost.".
Make a boat.
"Dad! What does the boat do?"
"I have lost track of the questions I need to ask you
before this makes sense..."
—Bart to dad