Law-Scale Wurm

Progression IV — {w}, {u}, or {g} (You may pay an
| additional {w}, {u}, or {g} up to four times as you cast
| this spell.)
|
| When Law-Scale Wurm enters the battlefield,
|= I: Your opponents can't cast spells this turn.
|= II: Shuffle any number of target cards from
| among graveyards into their owners' libraries.
|= III: Return up to two target noncreature,
| nonland permanents to their owners' hands.
|= IV: Exile all other creatures.