Gilfoyle, System Architect

Coders you control have menace

Whenever a Coder you control deals combat damage
to a player, that player mills that many cards.
At the beginning of your end step, choose target artifact or creature card in an opponent's graveyard
that was put there from their library this turn. Put it
onto the battlefield under your control.

"I built our network security myself.
I'm not worried about it at all"