Daenerys, Breaker of Chains

Opponents lose control and can't gain control
of permanents they don't own.

When Daenerys, Breaker of Chains enters the
battlefield, if one or more creatures you control
was dealt damage this turn, Daenerys, Breaker
of Chains deals that much damage split among
up to any number of creatures target opponent
controls.

"I will answer injustice with justice."