Polymorph

Sorcery    (CMC:4)

Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of his or her library until he or she reveals a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into his or her library.

67 M10 • ENRobert Bliss

™ & © 1993—2009 Wizards of the Coast

Legal in: Modern,Mirage Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Polymorph {3}{U} Sorcery Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of his or her library until he or she reveals a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into his or her library.

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View this MTG card on Gatherer

10/4/2004
If there are no creatures in the player's library, then the target creature is still destroyed, you see all the cards in that player's library, and then they shuffle and continue play.
10/1/2009
If the targeted creature is an illegal target by the time Polymorph would resolve, the entire spell is countered. Nothing else happens.
10/1/2009
If there are no creature cards in the player's library, all the cards in that library are revealed, then the library is shuffled. (The targeted creature remains destroyed.)
10/1/2009
A "creature card" is any card with the type Creature, even if it has other types such as Artifact, Enchantment, or Land. Older cards of type Summon are also Creature cards.
7/1/2013
If the targeted creature has indestructible, it's still a legal target -- it just isn't destroyed. The rest of Polymorph's effect happens as normal.

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Card Polymorph is not on TCGPlayer.