Seas of Change

At the beginning of your end step, if you don't
control a Whale creature, create a 5/5 blue
Whale creature token with flying.
Whenever a Whale you control attacks or
becomes the target of a spell, you may search
your library for a basic land card and put it into
your hand. If you do, shuffle your library.
{5}{g}{u}: Create a 5/5 blue Whale creature token
with flying.