Amber Prison

Artifact, 4 (4)
You may choose not to untap Amber Prison during your untap step.

{4}, {T}: Tap target artifact, creature, or land. That permanent doesn't untap during its controller's untap step for as long as Amber Prison remains tapped.¹
Illus. Donato Giancola

Format Legality	Legal in Vintage, Legacy, MTGO Classic Banned in Extended, Standard
Printings (2/12)	Classic Sixth Edition (Rare) Mirage (Rare)