Contested Cliffs

Land
{T}: Add {1} to your mana pool.
{R}{G}, {T}: Choose target Beast creature you control and target creature an opponent controls. Each of those creatures deals damage equal to its power to the other.¹
Illus. Anthony S. Waters

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: If either target is illegal when the ability resolves, it will do nothing.

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