Vraska the Unseen

Oracle Text

+1: Until your next turn, whenever a creature deals combat damage to Vraska the Unseen, destroy that creature.

−3: Destroy target nonland permanent.

−7: Create three 1/1 black Assassin creature tokens with "Whenever this creature deals combat damage to a player, that player loses the game."

Card Rulings

10/1/2012 If an effect creates a copy of one of the Assassin creature tokens, the copy will also have the triggered ability.
10/1/2012 Each Assassin token’s triggered ability will trigger whenever it deals combat damage to any player, including you.