Instant, 1U (2) Counter target spell or ability an opponent controls that targets a land you control. If a permanent's ability is countered this way, destroy that permanent.
1/1/2006: Remember that a spell only targets something if it is an Aura or uses the phrase "target" in its text.
1/1/2006: If none of the targeted spell's targets is a land when Teferi's Response would resolve, Teferi's Response is countered on resolution due to having no legal targets.