Scroll of Polymorph

If the spell is on your class's spell list, you can
read the scroll and cast its spell without providing
any material components. Otherwise, the scroll is unintelligible. If the spell is on your class's spell
list but of a higher level than you can normally
cast, you must make an ability check using your spellcasting ability to determine whether you cast
it successfully. The DC equals 10 + the spell's
level. On a failed check, the spell disappears from
the scroll with no other effect.