Karoo

Land
Karoo enters the battlefield tapped.

When Karoo enters the battlefield, sacrifice it unless you return an untapped Plains you control to its owner's hand.

{T}: Add {1}{W} to your mana pool.¹
Illus. Zina Saunders

Gatherer Card Rulings [Nov 2009]

• 2/1/2006: This has a triggered ability when it enters the battlefield, not a replacement effect, as previously worded.

Format Legality	Legal in Vintage, Legacy, MTGO Classic Banned in Extended, Standard
Printings (1/6)	Visions (Uncommon)