Silco, the Industrialist

Whenever a creature an opponent controls dies, exile it with a hit counter on it.

Assassins, Mercenaries, and Rogues you control
have deathtouch and "Whenever this creature deals combat damage to a player, you may remove a hit counter from a card that player owns in exile.
If you do, draw a card and create two Treasure tokens."

[Mari, the Killing Quill]