Ceaseless Betrayals

Whenever a creature deals combat damage to a player who owns it, that player discards a card.
{4}: Gain control of target creature until end of turn. Untap it. It gains haste. Any player can activate this ability.
"A man in dark armor and a pale pink cloak spotted with blood stepped up to Robb. 'Jaime Lannister sends his regards.' He thrust his longsword through her son's heart, and twisted."