Outbreak

Sorcery, 3B (4)
You may discard a Swamp card rather than pay Outbreak's mana cost.
Choose a creature type. All creatures of that type get -1/-1 until end of turn.¹
This plague chooses its victims.
Illus. Quinton Hoover

Crystal Keep Rulings Summaries

• You may discard a non-basic land that "counts as" or "is" a swamp. [DeLaney 2000/05/29]
• You choose the creature type during resolution. [D'Angelo 2008/02/05]
• Note - Also see Rule 212.1e for how to choose a creature type.

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