Hyrsam, the Prince of Fools

Hyrsam, the Prince of Fools costs {1} less to cast
for each creature you opponents control.
When Hyrsam enters the battlefield, goad all
creatures you don't control. (Until your next turn,
those creatures attack each combat if able and attack
a player other than you if able.)
Whenever a goaded creature deals combat
damage to you, its controller sacrifices it.