Shared Animosity | Magic: The Gathering
Formats Shared Animosity is Legal in
Official Oracle Text for Shared Animosity
—Vessifrus, flamekin demagogue
Official Rulings for Shared Animosity
4/1/2008 : In a Two-Headed Giant game, only creatures you control trigger the ability and get the bonus, but your teammate's attacking creatures are included in the calculation of those bonuses.