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Polymorph

Card Name

Polymorph

Mana Cost

3

Type

Sorcery

Rarity

Rare

rules Text

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.

Legal Formats

Commander, Legacy, Modern, Vintage

Not Legal Formats

Alchemy, Brawl, Explorer, Historic, Pauper, Pioneer, Standard

Rulings

(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 doesn't resolve. 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.