Goat Format · April 2005
What the Goat Format rulings add to, or change from, the rulings above.
"Two-Pronged Attack" is a targeting effect, targeting three monsters.
Edison Format · March 2010
What the Edison Format rulings add to, or change from, the rulings above.
"Two-Pronged Attack" targets 2 monsters you control and 1 monster your opponent controls. Destroying 2 of your monsters is not a cost.