Intervene

Instant, U (1)
Counter target spell that targets a creature.
"At first I simply observed. But I found that without investment in others, life serves no purpose." -Karn, silver golem
Illus. Heather Hudson

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: If a spell is modal, use the target(s) of the current mode only for this check. Targets for the other modes are never selected.
• 10/4/2004: Intervene can only target a spell that is currently targeting a creature.
• 10/4/2004: It means "targeting at least one creature" not "exactly one creature".
• 10/4/2004: If the spell's target leaves the battlefield before this spell resolves, Intervene will be countered since it no longer targets a spell that targets a creature.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/6)	Urza's Legacy (Common)