Magikarp

Sacrifice an island. Create a 1/0 blue elemental tok
Magikarp's evolve ability costs {u}{u} for each
Splash counter on it.
Splash - {1}{u}{t} Place a Splash counter on
Magikarp. Create a 1/0 blue elemental token.
Evolve {4}{u}{u}{u}{t} Sacrifice Magikarp. Search
your hand and library for a card named "Gyrados"
and place it on the battlefield tapped.