Boulder Toss

Target creature with the highest power you
control cannot be blocked this turn by target
creature with the lowest toughness an opponent controls.

"So, for example, if I command an elephant to attack
you, and you step behind a mouse, and the elephant
crushes the mouse, does he not still attack you? Why
would you be okay after that? Common sense says you
get crushed right then and there."
~Axonn, the Cold Murder