Cersei, Queen Regent

Castamere—Whenever a red creature enters the
battlefield under your control, if you are the
monarch, Cersei deals 3 damage to target player.
Tap three untapped creatures you control: Gain
control of target permanent until end of turn.
Untap it. It gains haste until end of turn.
"When you play the game of thrones, you win or
you die. There is no middle ground."