Migrating Mereel

Adrift 3 (You may pay N mana and reveal this card
in your hand. If you do, put it on the bottom of your library, then reveal the top N cards of your library.
You may cast a card that shares a type with this card
that costs N or less. Put the rest of the revealed cards
on the bottom of your library.)
Flying
They say that when the Mereel migrate, that those
on land should seek shelter. Nobody knows what
wonders or horrors chase the Mereel.