Rhythm of the Patient

At the beginning of your upkeep, exile the
top card of your library face down and look at
it. If it's a land card, you may reveal it and
put it into your hand. If you don't, create a
0/ 0 green and blue Fish creature token with
a +1/+1 counter on it. When that token dies,
you may pay {u}. If you do, put the exiled
card in your hand.